There has been a spate of spear-phishing attacks against a number of high-profile targets in the last few months, including RSA and others, and that trend is continuing unabated. Researchers have come across a fresh attack using the familiar malicious PDF attachment that appears to be targeting users in the defense industry.
“After this, a decoy PDF file is shown to the end user. The decoy is a call for papers for 2012 AIAA Strategic and Tactical Missile Systems Conference, which is a US conference classified as SECRET.”
These kinds of attacks have become an effective tool in the arsenal of attackers who are looking either to go after a user in one specific company or to get as many victims as possible in a short amount of time. The RSA attack was the most well-publicized of these attacks, but there have been a number of others in recent months as well, and they tend to follow a set pattern that involves doing some reconnaissance on a potential target, finding attractive topics for the email and crafting a message that appears to be from a trusted source.