Zbot Desperately Seeking AIM Users.
The Zbot keylogger campaign-of-the-month targets users of AOL Instant Messenger (AIM) with a message that claims to be an update notification for users of the instant messaging client application. Users unfortunate enough to click through the link in the email message to download what they think is something called “aimupdate_18.104.22.1685.exe” will be in for a rude awakening.
The malicious page delivers its payload whether or not a victim clicks the link to get executable file: It opens an iframe to a site that attempts to use vulnerable versions of Adobe Reader to push the Zbot keylogger down to the victim’s computer, then execute it, within a few moments of the page loading.
Source - Zbot Desperately Seeking AIM Users | Business Computing World