Overview
A DOCX file contains meaningless visible text, but the flag is hidden inside an embedded image in the DOCX archive structure.
Reconnaissance
Since DOCX files are ZIP archives, we rename the file extension to .zip and extract it.
Exploitation Strategy
Inspect the extracted media directory word/media/ and view image1.png or run strings on media files to reveal hidden text.
Solution Code
cp docx.docx docx.zip && unzip docx.zip
strings word/media/*
# Flag: hwj{d0c_1s_4l50_a_z1p}Flag
hwj{d0c_1s_4l50_a_z1p}