A new wave of attacks suggests that the malicious hackers behind a security compromise at Google and a number of other prestigious U.S. firms are back in business, this time using an unpatched security flaw in Adobe s PDF (Portable Document Format) Reader application. The latest attacks appear to date back at least to the beginning of this month, when researchers say they began seeing attacks leveraging the recent Adobe 0 day vulnerability in PDF Reader that used social engineering attacks in particular: specially crafted e-mail messages that contained a malicious PDF file attachment.
Source: https://threatpost.com/researchers-google-aurora-attackers-back-business-091310/74459/