<http://schema.org/description>
"Malware designed to damage computer systems is being secreted into portable documents commonly known as pdf by cybercriminals whose efforts usually are thwarted by antivirus software."^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.upi.com/Business_News/Security-Industry/2011/12/13/Malware-creeping-into-portable-documents/UPI-80081323800008/?rel=98301343128516>