New at table, villain insta-pushes river, wtf.

PokerStars No-Limit Hold'em Tourney, Big Blind is t30 (9 handed) Hand History Converter Tool from FlopTurnRiver.com (Format: ITH Forums)

saw flop|saw showdown

BB (t1195)
UTG (t1830)
UTG+1 (t1630)
MP1 (t5990)
Hero (t3755)
MP3 (t1235)
CO (t595)
Button (t4110)
SB (t980)

Preflop: Hero is MP2 with , .
2 folds, MP1 calls t30, Hero calls t30, 2 folds, Button calls t30, SB completes, BB checks.

Flop: (t150) , , (5 players)
SB checks, BB checks, MP1 bets t120, Hero raises to t390, Button folds, SB folds, BB folds, MP1 calls t270.

Turn: (t930) (2 players)
MP1 checks, Hero bets t630, MP1 calls t630.

River: (t2190) (2 players)
MP1 bets t4940 (All-In), Hero ????

The push makes me think he is weak but risking your tourney life on the call ain't easy. If he's your standard donk I couldn't call fast enough and watch him turn over his aces before crying and screaming that it was rigged. Cant see him having 610 or J10 and playing the hand like that and I honestly don't see him pushing the full boat (although my reasoning may be why he did that, lol ).

Dunno why but the more I look at it the more i think he's got AA or KK, depending on how lucky/drunk i am feeling at the time I think i'd call.