Warning: PDF email attachment containing trojan


We have received the email described below, with an attached PDF containing a "trojan". The email looked like this:

From: Canada Post
Subject: IMPORTANT: Canada Post Delivery #9381747173 (probably a random number)
Content: We missed you, when trying to deliver! Please view the invoice and contact us with any questions. We will try to deliver again the following business day. c) 2010 Canada Post Corporation.

The delivery of these emails is now blocked. However, we would like to remind you that any attachments, including PDF files, can contain malicious content that can install trojans and other malware.

We remind you to open them only if they come from a trusted source. Do not open unexpected or suspicious emails even from someone you know, as many viruses are spread using false or stolen usernames.  Confirm with the sender if possible.