Awful spot with AJ late

[True North]

$20 Stars MTT, just over 100 left out of 900 starting. I'm about average in chips. Villain has been aggressive with his big stack.

PokerStars No-Limit Hold'em Tourney, Big Blind is t800 (8 handed) Hand History Converter Tool from FlopTurnRiver.com (Format: 2+2 Forums)

Hero (t15121)
MP2 (t4180)
CO (t4636)
Button (t25706)
SB (t26097)
BB (t17218)
UTG (t8884)
UTG+1 (t12806)

Preflop: Hero is MP1 with A[img]/images/graemlins/heart.gif[/img], J[img]/images/graemlins/diamond.gif[/img].
<font color="#666666">2 folds</font>, <font color="#CC3333">Hero raises to t2400</font>, <font color="#666666">3 folds</font>, <font color="#CC3333">SB raises to t4647</font>, <font color="#666666">1 fold</font>, Hero calls t2247.

Flop: (t9594) 7[img]/images/graemlins/club.gif[/img], J[img]/images/graemlins/spade.gif[/img], K[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">SB bets t5400</font>, Hero ???

I thought about this for a long time. The reraise from the SB seems very strong. Normally, I don't put him on much that I can beat. There's also a chance he may be making a play on me here, because I haven't been that active recently, thanks to terrible cards and a reasonably active table.

Raise all-in or fold?