DM_Blake |
Your question is oddly formed, so I'll answer what I think you meant to ask:
No, there is no attack roll necessary. All combat maneuvers use the attacker's CMB instead of his attack roll. Read the beginning of the Combat Maneuver section of the core rulebook for info on what the CMB is and how to roll it. Sunder follows these rules.
Usually someone attempts a sunder with a melee weapon, but the Archer is allowed to attempt it with an arrow, but this does not change the rules of how Sunder works. No attack roll, just a CMB roll instead. Techically, the book still calls it an "attack roll", but there is just the one "attack roll" using the CMB vs. CMD and there is no preliminary "attack roll" using Attack Modifier vs. AC.
You asked if you should roll the item's CMD, but CMD is never rolled. It is calculated as described in the Combat Maneuver section of the core rulebook. All you need to do is beat (or equal) the CMD of the guy holding the item and then you can apply the Sunder damage.
If the item is just sitting there (nobody holding it) then you don't use Sunder on it, you simply follow the rules for Smashing An Object.
StreamOfTheSky |
Sunder is a combat maneuver and thus uses the CMB roll versus CMD rather than an attack roll versus AC. Good luck!
Also worth noting that an Archer using trick shot would be applying his dexterity modifier to CMB, not his strength modifier. Unless he is using a different stat for his ranged attack rolls somehow.
For reference, see the FAQ on Weapon Finesse.