Today, the most common method of luring victims into a botnet involves client-side exploitation, and I expect to see even more of it as we move through 2007. In these attacks, the bad guys send content via email or by hosting it on Web pages. This content, often Microsoft Word documents, PowerPoint presentations, PDF documents and the like, should not be executable. In these cases, the attacker's file is carefully formatted to exploit a vulnerability in the associated document-reading application. A huge number of vulnerabilities have been discovered in these applications recently.
Most users have been educated to avoid running attachments that contain executables, and many organizations' mail servers even filter out executable attachments. But with an exploit for a normal document-viewing application, any type of attachment can contain executable code. Thus, users who would never run a .exe might get infected by viewing a .doc, .ppt, PDF or other file type. It's a sad state of affairs, and I expect that we'll see much more of that infection vector in 2007.
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