We have noticed that some people have received PDF attachments from unknown people with enticing subject lines and messages. Please do not open such attachments through your PDF viewer (Adobe Reader or Acrobat etc). You should immediately delete the mail if the sender is unknown.
There have been instances where these PDF documents have managed to install virus/Trojan on user computers once they are opened, using some vulnerabilities in the PDF reader software.
Play safe – open attachments from known people only.