Nope, its real and nasty
From http://www.symantec.com/
Security Response: W32.Bugbear@mm
W32.Bugbear@mm is a mass-mailing worm that is rapidly spreading to Windows
users.
The subject and attachment name of incoming emails are randomly chosen. The
attachment will have a double extension ending in .exe, .scr, or .pif.
Symantec Security Response has released virus definitions to protect against this
threat, as well as a removal tool to assist in recovering systems already infected.