Microsoft and Adobe said on Friday that EMET can protect users against attacks against the current zero day flaw in Reader by forcing a specific DLL into using ASLR. The exploit will then fail to use ROP successfully since it is expecting the DLL to be at a predictable location. This is happens thanks to two different mitigations:Mandatory ASLR: On Windows 7, Windows Vista, Windows Server 2008 R2, and Windows Server 2009 R2.2008 this mitigation will force the relocation of non ASLR-aware DLLs.
Source: https://threatpost.com/microsoft-anti-exploit-tool-protects-against-adobe-zero-day-091310/74460/