The score came at the end of a nine play, 80-yard drive. Skon completed 5 of 5 passes on the drive for 92 yards, including a pair of passes to Macari, who finished the day with seven grabs for 71 yards.
Skon was 19-of-29 passing in the game for 231 yards and the score.
Macari's touchdown put Georgetown (5-5, 2-2 Patriot League) up 10-0 following Matt MacZura's 20-yard field goal in the first quarter.
Bucknell's Sean Cobelli hit a 37-yard field goal in the fourth quarter, ending the Hoyas' shutout bid.
The Bison (2-8, 0-5) managed just 168 yards of offense and seven first downs to Georgetown's 22.
The win snapped a four-game losing streak in the series for Georgetwon.
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