Be careful next time you receive an email with a PDF attachment. Once you open it, it will start to download viruses and malware.

E-mails containing malicious PDF files have been putting computers at risk since Friday, Finnish security software firm F-Secure said on Saturday. When such PDF files are viewed on vulnerable machines, they start downloading software from servers in Malaysia or Sweden, which are now being cleaned, he said. “There will be more such attacks.

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