Virus can hide anywhere in the image, audio file, text file, and sometimes it can also be hidden, sent in together with the IP address. If you have a good anti-virus, you should not be afraid. Even if a good hacker did this Virus, Anti-Virus should hand deal with him, if not, change the anti-virus.
And remember, use only one firewall! If your antivirus has a built-in firewall, disable the firewall system, or vice versa.