Pacific stunned Oregon by taking a seven-point halftime lead, but after shooting 37 percent in the first half the Ducks hit almost 80 percent of their field goal attempts in the second half.
Moser finished with 19 points and Young had 14. Oregon outscored the Tigers 56-26 over the final 20 minutes.
Oregon remained unbeaten in five games this season while Pacific fell to 4-1.
Trevin Harris and T.J. Wallace both had 14 points for the Tigers.