Is there a virus scan integration available?
Not a virus scanner but we do have paid tools that help you manage dependencies and will look for vulnerabilities as well as other criteria like licensing, popularity, age etc.
Nexus Firewall: Nexus Firewall - Application Security | Sonatype
Nexus Lifecycle: Nexus Lifecycle - Continuously clean your entire software supply chain | Sonatype
We added an integration between the repo and OSS Index in 3.26.0. You can see a demo video here: Repository Health Check for Nexus Repository Manager OSS | Sonatype