KLA10976
Microsoft Windows PDF Library vulnerability

An unspecified vulnerability was found in the Microsoft Windows PDF Library. By exploiting this vulnerability malicious users can execute arbitrary code. This vulnerability can be exploited remotely via a specially designed PDF file.

Microsoft Edge
Microsoft Windows 8.1
Microsoft Windows RT 8.1
Microsoft Windows 10
Microsoft Windows Server 2012
Microsoft Windows Server 2012 R2

Install necessary updates from the KB section, that are listed in your Windows Update (Windows Update usually can be accessed from the Control Panel)