This indicates an attack attempt to exploit a Information Disclosure vulnerability in Microsoft Windows.
The vulnerability is due to an error when the vulnerable software handles a maliciously crafted EMF file. A remote attacker can exploit this to gain unauthorized access to sensitive information, via a craft EMF file.
Windows Server 2008
Windows Server 2008 R2
Windows Server 2012
Windows Server 2012 R2
Windows Server 2016
Information Disclosure: Remote attackers can gain sensitive information from vulnerable systems.
Apply the most recent upgrade or patch from the vendor.