This indicates an attack attempt to exploit an Information Disclosure vulnerability in Microsoft Internet Explorer.
The vulnerability is due to an error when the vulnerable software handles a malicious URI. An attacker can exploit this by tricking an unsuspecting user into opening a crafted file and obtain sensitive information about the system.
Internet Explorer 9
Internet Explorer 10
Internet Explorer 11
Internet Explorer 11 on Windows 10
Information Disclosure: Remote attackers can gain sensitive information from vulnerable systems.
Apply the most recent upgrade or patch from the vendor.