Subject line reads: Setting for your mailbox are changed

Currently, this vulnerability is being used as part of an attack that spreads via an email that may include descriptive verbiage such as the following:                  
                         Subject: setting for your mailbox are changed
                         Attached: doc.pdf

Users should not open this email or the attachment. The email includes an infected PDF attachment called "doc.pdf," which, when opened, runs a set of scripts and executables on the recipient's computer that infect or spoof various Windows programs and services.  The methods used do not require JavaScript in order to execute.  Once infected, the machine will then periodically contact malicious Web locations to download and update itself with any of the latest malicious and data-stealing viruses.