I'd only been playing on this table for 1 round so I didn't have any good reads on the guy. When I made the call I thought he probably had AJ+ and was scard of the straight and flush draws. Is this a good assumption or should I give him credit for something big?

Party Poker No-Limit Hold'em, $0.04 BB (7 handed) Party Poker Converter Tool from FlopTurnRiver.com (Format: FlopTurnRiver)

BB ($4.52)
UTG ($1.12)
MP1 ($4.93)
MP2 ($6.17)
CO ($6.92)
Hero ($4.94)
SB ($3.73)

Preflop: Hero is Button with 8, 7.
UTG calls $0.04, MP1 calls $0.04, 1 fold, CO calls $0.04, Hero calls $0.04, SB raises to $0.22, BB calls $0.18, UTG calls $0.18, MP1 folds, CO calls $0.18, Hero calls $0.18.

Flop: ($1.14) 7, 8, A (5 players)
SB calls $3.71 (All-In), BB folds, UTG folds, CO folds, Hero calls $3.51.

Turn: ($8.16) 8 (2 players, 1 all-in)

River: ($8.16) 3 (2 players, 1 all-in)

Final Pot: $8.17