BOSTON (Reuters) - Adobe Systems Inc is investigating a report by a cybersecurity firm that hackers exploited previously unknown bugs in its Reader and Acrobat software to launch sophisticated attacks on personal computers. FireEye, a Silicon Valley company that helps businesses fight cyber attacks, told Reuters it obtained so-called PDF files tainted with malicious software, which can take advantage of the newly discovered bugs. It declined to identify any victims of the attacks. A spokeswoman for Adobe said that the company is investigating the report, which surfaced late on Tuesday. ...