PDF files are often used for exchanging documents between corporations and individuals, and are also being used for publishing documents on the web, as most web browsers are able to read PDF documents (after installing plug-ins).
Critical vulnerabilities have been identified in Adobe Reader and Adobe Acrobat. These vulnerabilities could cause the application to crash and potentially also allow an attacker to take control of the affected system.
Patches for these vulnerabilities are available. More information with links to updates are available in Adobe's security bulletin.
Norman recommends that you update your Adobe Acrobat/Reader installation as soon as possible.
