'If I had to win one on this tour, this would be it,' said Boros. 'This is like a second hometown to me.'
Chris Couch shot a 5-under 67 to finish one shot back at 12-under-par 276 along with Bob Heintz. Overnight leader Stan Utley, who struggled with a final-round 77, shared fourth place with Roland Thatcher and Scott Sterling at 11-under-par 277.
Boros, who was five shots off of Utley's pace to start the final round, battled hard to keep things under control on the front side. He opened with a birdie at the par-5 second but found trouble with a bogey at the fifth.
The 38-year-old recovered with back-to-back birdies from the sixth but found trouble again with a bogey at the eighth. Boros responded with a birdie at the ninth to make the turn at 13-under but trouble loomed around the turn.
Boros stumbled with a bogey at the 10th and added another mistake with a bogey at the 12th to stay at even-par for his round.
While Boros failed to make a significant move, he managed to remain in contention while his competitors, mainly Utley, struggled through problems of their own.
'I didn't think Stan was catchable today,' said Boros. 'Luckily, he and a couple of others came back to me this afternoon.'
Utley, who was in search of his first victory since 1995, collected two birdies and two bogeys over his first nine holes before collapsing completely down the stretch.
The 41-year-old tallied three consecutive bogeys starting at the 10th and dropped another shot at the 15th to fall back to 12-under. He was soon joined by several players in an eventual four-way tie for first.
'It was my tournament. I played great early on but I failed to capitalize,' said Utley. 'I didn't intend to hold on too tight but obviously there wasn't much feeling in those hands out there because I was struggling to get it to the hole.'
Boros kept plugging along and used a late run to secure the title. He birdied the 17th to grab a share of the lead at 12-under and grabbed the title with a 12-foot birdie at the par-4 18th.
Bubba Watson, Zach Johnson and Bo Van Pelt finished three shots off the pace at 10-under-par 278. They were followed by Hunter Haas, Tom Scherrer and Paul Claxton at 9-under-par 279.
Shane Bertsch, who was alone in second place at the start of the final round, managed a closing 77 to share 13th place at 8-under-par 280.