The only way is to submit it, if you can, to Avert labs who will issue you with an extra.dat if it is in fact OK.
You may have to disable VirusScan again in order to accomplish it.
Send a file to Avert for analysis:http://vil.nai.com/vil/submit-sample.aspx
Email file to: firstname.lastname@example.org
When submitting samples via E-mail all samples must be packaged in a .ZIP file. When creating this .ZIP file, it is important to understand that the .ZIP can be no more than 3 megabytes in size and can contain no more than 30 files. Additionally, any .ZIP file created must be password-protected using the password "infected" (minus the ""). Failure to follow these guidelines will cause your submission to be rejected.