This indicates an attack attempt against an Information Disclosure vulnerability in Samsung Web Viewer for Samsung DVR devices.
The vulnerability is caused by a lack of sanitizing of access requests to files or user-setup web pages. It allows a remote attacker to gain sensitive information from vulnerable systems via a crafted http request.
Samsung Web Viewer for Samsung DVR
Information Disclosure: Remote attacker can gain sensitive information from vulnerable systems.
Currently we are unaware of any vendor supplied patch for this issue.