Only 30 or so hands on opponent, hasnt opened up a pot and has played passively.

Full Tilt No-Limit Hold'em, $1 BB (9 handed) Hand History Converter Tool from FlopTurnRiver.com (Format: FlopTurnRiver)

UTG+1 ($50.20)
MP1 ($214.80)
MP2 ($29.40)
MP3 ($27.15)
CO ($30)
Button ($125.60)
SB ($157.90)
Hero ($160.35)
UTG ($44.85)

Preflop: Hero is BB with J, J.
2 folds, MP1 calls $1, 2 folds, CO checks, Button calls $1, SB completes, Hero raises to $7.5, MP1 calls $5.50, CO folds, Button calls $5.50, SB calls $5.50.

Flop: ($28) K, K, T (4 players)
SB checks, Hero bets $19, MP1 calls $19, Button folds, SB folds.

Turn: ($66) K (2 players)
Hero bets $48, MP1 calls $48.

River: ($162) 9 (2 players)
Hero bets $86.85 (All-In)