I wouldn't think badger; spiders don't strike me as something that would rage like a badger.
I would think it would need to be something with a single attack, since spiders use their legs for movement and manipulation, not slashing or stabbing.
Snake wouldn't actually be a bad chassis. It's a bit slow with only 20' movement, but it has a climb and swim speed (some spiders can actually walk across water, though it's more of a function of their small size than anything else). The snake's constrict at later levels can be re-skinned as being wrapped in silk. It's support benefit could be described as all it's legs interfering with the target's ability to react.
Edit: To make it more spidery, start with snake, ditch the scent and swim ability, then replace both with either "All Around Vision" (lots of eyes all over its head), or short range "Tremorsense," (spiders are very sensitive to vibrations).
Might also replace the advanced Constrict ability with an appropriate Poison, but would require more work to find a poison that was comparable in effect to the constrict.
