Chapter 10 Install and System Administration for FortiOS 5.0 : FortiGuard : Security tools : Online virus scanner
  
Online virus scanner
If you discover a suspicious file on your machine, or suspect that a program you downloaded from the Internet might be malicious you can scan it using the FortiGuard online scanner. The questionable file can be uploaded from your computer to a dedicated server where it will be scanned using FortiClient Antivirus. Only one file of up to 1 MB can be checked at any one time. All files will be forwarded to our research labs for analysis.
http://www.fortiguard.com/antivirus/virus_scanner.html
See Also
URL lookup
IP and signature lookup
Malware removal tools
FortiGuard Services
Antivirus and IPS
Web filtering
Email filtering
Security tools
Troubleshooting