It's initially worrying, but it makes a certain amount of sense when you think that an antivirus is a blacklist (of known vulnerabilities), not a whitelist. So

It's initially worrying, but it makes a certain amount of sense when you think that an antivirus is a blacklist (of known vulnerabilities), not a whitelist. Somewhat related: http://security.stackexchange.com/a/117312 http://security.stackexchange.com/a/117312