A week after the visitors met with malware based ad New York Times website, a similar attack struck Popular sites such as the Drudge Report and Horoscope.com. Trojans were based pdf and were delivered through advertising networks like DoubleClick to Google.
The added would appear almost invisible in the browser window of the victim that contained maliciously encoded pdf document, which included attack code that placed a variant of the Trojan Win32 / Alureon on the computer of the victim.
The virus attacked computers running earlier versions of Adobe Acrobat Reader. PDF vulnerabilities are quite common, which is why Acrobat seems to need monthly updates. It is easy to ignore these reminders, but keeping your updated software is part of a three-pronged approach to computer security that also includes an Internet security software and common sense.