The bounty is rusting. It's clear he hasn't been taking care of himself. Yep, he is an Autobot. Obviously an Autobot who is wanted because he did something baaaaaad. What I love about TFA is that the Autobots are all "heroes". They're just civilians like everyone else with everyday normal problems these 'bots go through. Some are normal guys doing normal things, some become greater figures in history, some become criminals.
For that matter, he has guns. So you know he's done bad shit. I kid, of course. Word of God stated much of the Autobots prefer tools as their weapons instead of, ya know, actual weapons, but that doesn't necessary mean they can't have guns. Otherwise, Perceptor wouldn't be rocking his.
Last panel BTW is Perceptor's gun shot (the yellow laser thing). His gun is modeled after Yoko's from Gurran Lagann, including the lightning-like bullets he shoots.