This indicates an attack attempt to exploit a Memory Corruption vulnerability in Hancom Office.
The vulnerability is due to an error when the vulnerable software handles a maliciously crafted hwpx file. An attacker can exploit this to execute arbitrary code within the context of the logged in user via a crafted hwpx file.
Hancom Office Common Elements 2014 below 188.8.131.5289
Hancom A / article 2014 below 184.108.40.20639
System Compromise: Remote attackers can gain control of vulnerable systems.
Apply the most recent upgrade or patch from the vendor.