Overcoming a slow start and three big turnovers, Arizona (8-5) recovered an onside kick in the last minute, setting up Scott's 2-yard toss to Tyler Slavin with 19 seconds left for the winning score.
Arizona trailed 21-0 in the first quarter and was down 45-28 entering the final period. Scott threw for 382 yards and marched his team back into the game despite two earlier interceptions.
The nation's rushing leader, Ka'Deem Carey, gained 172 yards for the Wildcats and but fell short of becoming only the 16th running back in NCAA history to reach 2,000 yards in a season.
Cody Fajardo threw for three touchdowns and ran for another score to lead the Wolf Pack (7-6).
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