I've never had the opportunity to play a spellthief so I can't offer a lot of advice. I'm just stopping by to drop of a link.
Fan-made content, but perhaps you'll find something you like in there.
You should just use the Eldritch Scoundrel Rogue Archetype, I think it's as close as you'll get but you wont have the actual spell stealing effect.
I've never had the opportunity to play a spellthief so I can't offer a lot of advice. I'm just stopping by to drop of a link.
Fan-made content, but perhaps you'll find something you like in there.
Actually, this is the updated Spell Thief, just not changed on the community site and is a Rogue/Arcanist MCA.
The old Rogue/Sorcerer MCA has been revamped into the Blood Bandit.
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Spellthief
BAB: +3/4
Good Saves: Will
Hit Dice: 1d8
Class Skills: Acrobatics, Appraise, Bluff, Climb, Craft, Diplomacy, Disable Device, Disguise, Escape Artist, Fly, Intimidate, Knowledge arcana, Knowledge local, Linguistics, Perception, Profession, Sense Motive, Sleight of Hand, Spellcraft, Stealth, Swim, Use Magic Device.
Skill Ranks per Level: 6 + Intelligence modifier
Spellthieves are proficient in all Simple Weapons, all Light Martial Weapons, and Light Armor.
Spellthieves use the Paladin spells per day table. They may select spells from the Sorcerer/Wizard list from the schools of Abjuration, Divination, Enchantment, Illusion, and Transmutation.
LEVEL ABILITY
1. Sneak Attack +1d6, Steal Spell (0-1st), Trapfinding
2. Spell Grace +1, Steal Spell Effect, Talent
3. Steal Energy Resistance 10
4. Steal Spell (2nd), Talent
5. Sneak Attack +2d6, Steal Spell-like Ability
6. Steal Spell (3rd), Talent
7. Absorb Spell
8. Steal Spell (4th), Talent
9. Sneak Attack +3d6, Arcane Sight
10. Steal Spell (5th), Advanced Talents, Talent
11. Spell Grace +2, Steal Energy Resistance 20
12. Steal Spell (6th), Talent
13. Sneak Attack +4d6, Discover Spells
14. Steal Spell (7th), Talent
15. Steal Spell Resistance
16. Steal Spell (8th), Talent
17. Sneak Attack +5d6, Greater Arcane Sight
18. Steal Spell (9th), Talent
19. Steal Energy Resistance 30
20. Absorb Spell (immediate casting), Spell Grace +3, Talent
Talents. At 2nd level, and every 2 levels thereafter, the Spellthief gains one talent from the list below.
Channel Spell (Su). As the duskblade ability. The spellthief must be at least 4th level to choose this Talent.
Cantrips (Sp). The spellthief learns a number of cantrips equal to his Charisma bonus (minimum 1).
Disrupt Caster (Ex). If the spellthief successfully sneak attacks a target capable of casting spells or using spell-like abilities, the target suffers a penalty equal to the spellthief's number of sneak attack dice on caster level checks.
Disrupt Concentration (Ex). If the spellthief successfully sneak attacks a target capable of casting spells or using spell-like abilities, the target suffers a penalty equal to twice the spellthief's number of sneak attack dice on Concentration checks to Cast Defensively for as long as the spellthief threatens the target.
Familiar (Su). The spellthief gains a familiar as if he had a wizard level equal to his spellthief class level.
Focusing Attack (Ex). If the spellthief successfully sneak attacks a target, for 1 minute the target suffers a penalty equal to the number of sneak attack dice the spellthief has on Saving Throws for any spells the spellthief casts on the target.
Spell Power (Ex). If the spellthief successfully sneak attacks a target, for 1 minute, he gains a bonus on caster level checks to overcome the target's Spell Resistance equal to the number of sneak attack dice the spellthief has.
Advanced Talents. Beginning at 10th level, the Spellthief adds the following Advanced Talents to the list of Talents he may choose from.
Anchoring Attack (Su). Opponents that are dealt sneak attack damage by a spellthief with this ability are affected by a Dimensional Anchor. The caster level for this effect is equal to the spellthief's level.
Banishing Attack (Su). Opponents that are dealt sneak attack damage by a spellthief with this ability are affected by a Banishment. The caster level for this effect is equal to the spellthief's level. The spellthief must have the Anchoring Attack talent before choosing this talent.
Disjoining Attack (Su). Opponents that are dealt sneak attack damage by a spellthief with this ability cannot use any spellcasting, spell-like, or supernatural abilities for 1 round. The spellthief must have the Greater Dispelling Attack talent before selecting this talent.
Dispelling Attack (Su). Opponents that are dealt sneak attack damage by a spellthief with this ability are affected by a targeted Dispel Magic, targeting the lowest-level spell effect active on the target. The caster level for this ability is equal to the spellthief's level.
Forbidden Magic (Ex). The spellthief adds a single spell, up to the highest level spell he can cast, to his list of spells known. This spell must be of the Conjuration, Evocation, or Necromancy school. The spellthief may select this Talent multiple times, selecting a different spell each time.
Greater Dispelling Attack (Su). Opponents that are dealt sneak attack damage by a spellthief with this ability are affected by a targeted Greater Dispel Magic, targeting the lowest-level spell effect active on the target. The caster level for this ability is equal to the spellthief's level. The spellthief must have the Dispelling Attack talent before selecting this talent.
Greater Necrotic Attack (Su). Opponents that are dealt sneak attack damage by a spellthief with this ability cannot benefit from any magical healing for 1 hour per level of the spellthief.
Impromptu Sneak Attack (Ex). Once per day, the spellthief can declare one melee or ranged attack he makes to be a sneak attack (the target can be no more than 30 feet distant if the impromptu sneak attack is a ranged attack). The target of an impromptu sneak attack loses any Dexterity bonus to AC, but only against that attack. The power can be used against any target, but creatures that are not subject to critical hits take no extra damage (though they still lose any Dexterity bonus to AC against this attack). The spellthief may select this talent multiple times, each time gaining 1 additional daily use of this ability.
Necrotic Attack (Su). Opponents that are dealt sneak attack damage by a spellthief with this ability are forced to make a saving throw against the effects of any conjuration (healing) effect for 1 hour per level of the spellthief.
Quick Cast (Ex). Once per day, the spellthief can cast any spell he knows as a swift action, as if using the metamagic feat Quicken Spell, without increasing the level of the spell.
Skill Mastery (Ex). As the rogue ability with the same name.
Slippery Mind (Ex). As the rogue ability with the same name.
Spellbreaker (Ex). The spellthief gains Spellbreaker as a bonus feat. He does not need to meet the requirements of the feat to select this talent.
Sudden Metamagic (Ex). Once per day, the spellthief can apply any metamagic feat he knows to a single spell he casts without increasing the level of the spell or the casting time.
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You might also check out New Paths 8: The Trickster from Kobold Press
The Trickster class is essentially an arcane rogue type of class that has built in customization through its Forte class feature, which include Acrobatics, Arcane Accomplice, Spell Pilfer and Beguile
The Spell Pilfer forte was designed specifically so you can play a spell thief type of Trickster