A security researcher has uncovered yet another vulnerability in Adobe Reader that allows hackers to execute malicious code on computers by tricking their users into opening booby-trapped files.Charlie Miller, principal security analyst at Independent Security Evaluators, disclosed the critical flaw at last week's Black Hat security conference in Las Vegas. It stems from an integer overflow in a part of the application that parses fonts, he said. That leads to a memory allocation that's too small, allowing attackers to run code of their choosing on the underlying machine. There are no reports of the flaw being targeted for malicious purposes.

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