A critical vulnerability, which is being actively exploited, has been discovered in Adobe's Acrobat products. Adobe Acrobat 7 Professional, Adobe Acrobat 7.x, Adobe Acrobat 8 Professional, Adobe Acrobat 8.x, Adobe Acrobat 9.x, Adobe Reader 7.x, Adobe Reader 8.x and Adobe Reader 9.x are all affected by a vulnerability that can be exploited to infect affected systems with malicious software.