Adobe will finally release the new version of its Reader software which will include the much-anticipated Protected Mode security feature next month. Adobe has been under intense criticism recently for the number and severity of vulnerabilities present in the last few releases of Reader in particular. The sandbox technology works by essentially preventing malicious code that is used to exploit a bug in Reader from allowing an attacker to break out of the application and gain access to other apps or the operating system. This is meant to stop attackers from using Reader as a jumping-off point for further attacks on the PC.
Source: https://threatpost.com/adobe-reader-x-protected-mode-due-november-101810/74579/