Attackers may be trying to exploit flaws in Adobe Reader by using attack code modified to evade antivirus products.
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.