What's a good Android app to keep my phone from getting messed up by viruses and junk, especially when I'm downloading plans off some sketchy job site?

Look, I'm not tech-savvy, but I know when my phone's acting up. Started getting pop-ups after downloading some blueprints from a site that looked like it was built in '95. So, I needed something to clean it up and keep it clean. Tried a few, but Norton360 Antivirus & Security actually gets the job done. It scans for viruses, gets rid of the junk files slowing things down, and seems to block those dodgy websites. It's like a digital foreman, keeping things in order. The battery life takes a hit when it's scanning, but I just plug it in overnight. The interface is straightforward enough, even I can figure it out. Rain doesn't stop it, and so far, it hasn't stopped a virus either. Built like a brick house, this app is.