Adobe’s PDF (Portable Document Format) is widely used to share documents via email attachments or web downloads. Adobe estimates that there are more than 20 million PDF files available on the Internet, and PDFs are commonly used in legal and medical documents, as well as for business contracts.

Windows users can upgrade to Adobe Reader 7.0.2 and Adobe Acrobat 7.0.2, which are available from the Adobe website. The company is preparing an update for Mac users. Until that update is available, Mac users can disable JavaScript in Acrobat by choosing Adobe > Preferences >JavaScript and deselecting “Enable Acrobat JavaScript.”