Cybercriminals will have to find another way into your PC's crown jewels. Adobe was preparing to fix a chief source of portable document format security vulnerabilities with the implementation of a "sandbox" in the next major revision of its popular Reader software.A sandbox in industry parlance isolated software from the rest of the PC and its programs including the operating system that could be compromised by malicious code.This "protected mode" in the PDF Reader software was based on Microsoft's practical windows sandbox and engineering smarts from search-advertising giant Google, said Adobe senior director of product security and privacy Brad Arkin.

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