Son, who played Random Task in the Austin Powers film, was convicted last week (ends26Aug11).
The female victim was attacked and abducted by Son and an accomplice on Christmas Eve in Huntington Beach, California, according to Los Angeles TV station KTLA.
Son allegedly raped the woman, sexually assaulted her with a gun and then released her naked.
DNA evidence did not link the actor to the attack until 2008.
Son will be sentenced on 19 September (11).