Adobe Acrobat Reader has not been my choice of free PDF reader utility thanks to it's security issues, bloat and intrusive updater. Adobe has now started to address these issues and the latest release of "Adobe Acrobat Reader X" features new security measure known as “Adobe Reader Protected Mode” which is a sandboxing functionality which basically isolates the PDF reader from rest of the system shielding the user computer from any threat embedded into the document, the technology is based on Microsoft’s “Practical Windows Sandboxing”.