This isn't really that bad to be honest. Based on the villain's stats and stack size I'd say he's probably calling here with almost any Ax hand and small PP maybe the occasional suited connector. Being the PFR I might have been inclined to b/f the flop to protect my hand. As played I thinking calling on the turn is okay and the river bet is pretty small so he is kind of pricing you in. However, having logged an excessive amount of hands at the micro stakes I see this as a pretty obvious Ax line. Something like A4-AT. Shrug, I'd probably fold river. But then again I'd have had him define his hand earlier than that.