Torabi scored a late goal in Dushanbe's Republican Central Stadium on Tuesday and sent two-time runner-up Persepolis into the quarterfinals.
The 17,000 spectators were stunned at the last seconds of the match.
Torabi defeated Bafetimbi Gomis, Jakub Swierczok, Vincent Aboubakar and Teerasil Dangda to win the accolade.
