You'd do better keeping your browsing habits in check than you would with an antivirus application.
I say this often. Security is a process, not an application.
Don't install dodgy software from dodgy sources. Don't give your password out to your friends who have physical access to your computer. Don't open up ports to the world wide web without proper security.
That sorta stuff...
All an AV app does is check to see if the file matches a signature. In the world of 0day exploits, that's just a resource waste. The time you spent installing and configuring it would have been better spent learning about your OS.
Does malware exist for Linux? Yes! Yes, it does!
Just don't install it.
Also, secure your browser. I shouldn't have to mention that. I don't care what OS you use, securing your browser is essential. Block scripts by default, and use least-privilege ideology. If you really want, learn to run your browser in a jail, like firejail.