Web users are being urged to upgrade their Adobe reader software as a security flaw is found in older versions of the program.
Millions of people use the reader software to view documents prepared in the popular PDF format.
Security researchers said malicious hackers exploiting the flaw could view victim's hard drives or use it to make phishing scams look more plausible. So far there is no evidence that the bug is being exploited in the wild.
The flaw is found in the web browser plug-in of the Adobe Reader software. Ordinarily this allows PDF documents to be viewed in a browser window.
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