A flowchart typical provided foxit can be better used to understand the Malware infection mechanism
It is unclear which group was behind the attack and what was their motive, but the exploit kit used shows similarities with the one used in infection of php.net in October 2013.Yahoo have already Confirmed they have removed the infected ads which where sharing Malware, and will be Monitoring any such ads in the future.
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source: www.techworm.net