This vulnerability allows attackers to craft a malicious document that when opened, allows the attacker to cause arbitrary code to be executed on the victims system. Vulnerability discovered by a member of Talos.com inc. the Hangul Office Suite, of which Hangul Word Processor is part, is the leading word processing and office productivity suite in South Korea. Vulnerabilities in office productivity software are useful to attackers who can use file formats which are frequently distributed over email to target their victims.”]
Source: https://blog.talosintelligence.com/2017/05/vulnerability-spotlight-hangul-word.html