Microsoft Edge in Microsoft Windows 10 Gold, 1511, 1607, 1703, 1709, and Windows Server 2016 allows an attacker to obtain information to further compromise the user's system, due to how the Microsoft Edge PDF Reader handles objects in memory, aka "Microsoft Edge Information Disclosure Vulnerability".
https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2018-0766