His birdie denied India's Jeev Milkha Singh, whose bogey dropped him into second spot as David Horsey gave another good account of himself in Jakarta.
The rookie professional from Styal, competing on a sponsor's invitation, strung together four tidy rounds, closing with a 69, to tie 44th on five-under-par.
He was too far behind to launch a challenge, but overnight leader Aguilar felt the pressure from half-a-dozen players before they fell away and left Singh as the lone threat.
Singh did not hit a stray shot early on, eagling the par five sixth and birdying the short eighth to leapfrog Aguilar. And the Chilean looked to have blown his chance when he three-putted the 15th only for his opponent to drop a shot at the next and half his lead to one stroke.
Aguilar said: "I knew I had to make a three on the last for a play-off. I didn't expect him to bogey.
"But it feels awesome to win. This is one of things I wanted to do when I decided to start playing golf again and come back out on Tour.
"I won twice on the Challenge Tour last year and I felt I had the game and that I was playing well.
"I just had to hope that it would be my week."
PHIL Mickelson won the Northern Trust Open at Riviera to clinch his 33rd PGA Tour title. Luke Donald and Padraig Harrington tied for third.
DUKINFIELD professional David Green defied rain and a strong wind to take a three-shot lead on the first day of the Lancashire PGA Overseas Pro-am at the Algarve resort of Vilamoura.
He strung together four successive threes from the ninth hole in a run of birdie, eagle, birdie par to forge ahead of title-holder David Shacklady, from Mossock Hall, with a three-under-par 69.
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