I just go with my gut (which usually says, "Get some food")...
At this low limit, I don't think a call here is terrible. I have called these pushes many times...and folded other times.
You said there was no read here, so I would look for any information I can find. If he has a stack larger than the table buyin, I might fold just giving him the benefit of doubt that he is an okay player.
If he has a small stack, I will call. Small stacks will often push allin with top pair. I KNOW...many of you play with short stacks just to get these kind of calls. But my experience has been that I run into fewer of you then I do the shortstacked idiots.
At a higher limit, I say you fold and wait for a better hand. At lower limits, it is up to your spidey sense. BTW, recently I have been folding more of these than I call...on the other hand, my earnings have dropped significantly the past two weeks.