Thank you all for your response.
We're building a PaaS where everything runs on Linux. As part of the security requirements, we have to deploy Antivirus as well. We chose ClamAV in this case. One of the requirement in terms of Antivirus is that we should enable reputation rating. The environment itself is pretty static once deployed. There's no email traffic in/out. It's just application traffic through WAF/ModSecurity. The files itself on the OS level are pretty static. So the ClamAV is used to scan the filesystem. So basically, I think it's just reputation rating on the files if any.
If it doesn't have it, is there any plugins/tools that can be used to achieve that? I haven't checked that PolicyD yet.
Many thanks,
Ray