f'n unknowns

[dave44]

I had just sat down and UTG is unknown. I have a decent amount of stats for 10/20 players so he's no regular.

Party Poker 10/20 Hold'em (5 handed) Hand History Converter Tool from FlopTurnRiver.com (Format: 2+2 Forums)

Preflop: Hero is BB with A[img]/images/graemlins/club.gif[/img], J[img]/images/graemlins/spade.gif[/img].
<font color="#CC3333">UTG raises</font>, <font color="#666666">3 folds</font>, Hero calls.

Flop: (4.50 SB) 3[img]/images/graemlins/diamond.gif[/img], J[img]/images/graemlins/diamond.gif[/img], K[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(2 players)</font>
Hero checks, <font color="#CC3333">UTG bets</font>, Hero calls.

Turn: (3.25 BB) 9[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(2 players)</font>
Hero checks, <font color="#CC3333">UTG bets</font>, Hero calls.

River: (5.25 BB) 6[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(2 players)</font>
Hero checks, <font color="#CC3333">UTG bets</font>, Hero calls.

Final Pot: 7.25 BB

What kind of lines do you guys like against an unknown here? More aggression?