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click OK and close the dialogue window to commit the changes.Īlso, you may want to do the same in your MS Edge browser, and disable from the current settings the option to open PDFs in a new browsing tab and instead choose to download PDF when you click on URLs that contain a PDF. Is this the defaulting method that you've tried?Īnother way, is to go to the folder where your PDFs are saved, right-click on any of them, select "Properties" from the context menu and change the program from MS Edge to Acrobat Reader. If you go to the apps settings in Windows 10, you can select the default PDF handler from these settings (a restart may not be required but it never hurts). This complements Microsoft's own Control Flow Guard (CFG).I assume that by Acrobat DC not Pro, you're referring to Adobe Acrobat Reader DV (free version PDF viewer). This includes compile-time mitigations such as Intel's new Control Flow Enforcement Technology (CET), enabled in Microsoft Edge with update 94 for CPUs that support it. "Alongside PartitionAlloc, we ensured that a suite of additional technical countermeasures, also already used across Microsoft Edge, were compatible with the new PDF stack. Microsoft also details its own contributions to Edge security mitigations. "This unique heap implementation provides a rapid understanding of vulnerabilities and a strong layer of protection that the new PDF stack will benefit from," Microsoft says. All of these help mitigate memory flaws like use-after frees, but they also create a performance overhead.
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This includes using security features developed by Google's Chromium team to mitigate C++-related memory flaws, including the relatively recent add-ons for MiraclePtr and heap memory scanning, as well as PartitionAlloc, Chromium's memory allocator.
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It says the Microsoft Edge Vulnerability Research team was "heavily involved" in the process of bringing the Acrobat engine into Edge. Microsoft detailed some of the work it's done to secure the browser's PDF stack. Turner claims that "using the free PDF experience with the Adobe engine will not allow Adobe to collect any data from you."
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