I cold-call the river, no raise, and might fold to any major raise after the first bet. There are way too many plausible hands ahead of you here, including AA, AK, KQ, and QQ. You're in a raised pot with four players... worst possible boat isn't too likely to hold up on that board, given the action. I'm already starting to feel queasy after the turn action and then the leadout bet on the river would cement it, especially given what the river card was.