You can check the virus result from virustotal.com
if the suspicious file is not shown as a virus in site by symantec and detected as a virus by other companies then submir the file to symantec security team. They can analysis the file and provide the rapid rwlease definition path against that virus.
Submit file on
https://submit.symantec.com/websubmit/retail.cgi
virus total site link
https://www.virustotal.com/en/