Attackers may be trying to exploit flaws in Adobe Reader by using attack code modified to evade antivirus products.
The Bethesda, Md.-based SANS Internet Storm Center (ISC) warned that malicious PDF files are exploiting the JavaScript
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Michael S. Mimoso, Editorial Director"The payload is in a JavaScript object embedded in the PDF document. Once extracted, it just contains first level obfuscation with a simple eval (unescape()) call," Zdrnja said.
Adobe released an update for Adobe Reader 8 and Acrobat 8. An attacker can pass a malicious PDF file to corrupt memory and cause the programs to crash. Adobe said.
Danish vulnerability clearinghouse Secunia gave the flaws a highly critical rating. Secunia said the flaws could be used to gain escalated privileges.