AJs against total donk

[Bowlboy]

Villain is 74/17/2.00 over 25 hands and is shaping out to be a real donk. A couple of hands prior to this he 3bet AI with A7s preflop.

PokerStars No-Limit Hold'em, $0.10 BB (4 handed) Hand History Converter Tool from FlopTurnRiver.com (Format: 2+2 Forums)

BB ($12.20)
UTG ($10)
Hero ($10.30)
SB ($4.25)

Preflop: Hero is Button with A[img]/images/graemlins/spade.gif[/img], J[img]/images/graemlins/spade.gif[/img].
<font color="#666666">1 fold</font>, <font color="#CC3333">Hero raises to $0.4</font>, SB calls $0.35, <font color="#666666">1 fold</font>.

Flop: ($0.90) 9[img]/images/graemlins/club.gif[/img], 4[img]/images/graemlins/spade.gif[/img], 6[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">SB bets $3.85 (All-In)</font>, Hero calls $3.85.

My reasoning for calling is as stated already he's a donk and this could be a total bluff, and I'm guessing I have a decent amount of equity against a lot of his range. He could be doing this any pocket pair or maybe any piece of the flop. There is already some dead money in the pot before his push as well.