Rascals are always sociable, and the chief sign that a man has any nobility in his character is the little pleasure he takes in others company. Arthur Schopenhauer

MS Office docx files may contain external OLE Object references as HTML files. There is an HTML scheme ms-msdt: which invokes the msdt diagnostic tool, what is capable of executing arbitrary code (specified in parameters).

The result is a terrifying attack vector for getting RCE through opening malicious docx files (without using macros). New Microsoft Office Zero-Day Exploit