Exploits of Adobe Systems Inc.'s PDF file format jumped dramatically last year and are continuing to climb during 2010, a McAfee Inc. security researcher said Wednesday.

Microsoft Corp., meanwhile, recently said that more than 46% of the browser-based exploits during the second half of 2009 were aimed at vulnerabilities in the free Adobe Reader PDF viewer.

According to Toralv Dirro, a security strategist at McAfee Labs, the percentage of exploitative malware targeting PDF vulnerabilities has skyrocketed. In 2007 and 2008, only 2% of all malware that included a vulnerability exploit leveraged an Adobe Reader or Acrobat bug. That figure jumped to 17% in 2009 and to 28% during the first quarter of 2010.

More: http://www.computerworld.com/s/article/9176117/