This is an exploit, and it is part of the massmailer Netsky.P
Please let BitDefender disinfect your files.
This vulnerability allows automatic execution of a HTML document from within a e-mail message, when opened or previewed with Internet Explorer from Outlook or Outlook Express. More information can be found here
This specific exploit is found in e-mail messages containing the virus Win32.Netsky.P@mm
For a detailed description of this virus, check the description of Win32.Netsky.P@mm in the Virus Encyclopedia.