Given this Microsoft Word document and after checking if there is anything visually relevant, we walk it using `binwalk` to look for file signatures within it.

```
$ binwalk -e microsooft.docx

DECIMAL HEXADECIMAL DESCRIPTION
--------------------------------------------------------------------------------
0 0x0 Zip archive data, at least v2.0 to extract, compressed size: 334, uncompressed size: 1374, name: [Content_Types].xml
383 0x17F Zip archive data, at least v2.0 to extract, name: _rels/
419 0x1A3 Zip archive data, at least v2.0 to extract, compressed size: 221, uncompressed size: 580, name: _rels/.rels
681 0x2A9 Zip archive data, at least v2.0 to extract, name: docProps/
720 0x2D0 Zip archive data, at least v2.0 to extract, compressed size: 284, uncompressed size: 508, name: docProps/app.xml
1050 0x41A Zip archive data, at least v2.0 to extract, compressed size: 350, uncompressed size: 731, name: docProps/core.xml
1447 0x5A7 Zip archive data, at least v2.0 to extract, name: src/
1481 0x5C9 Zip archive data, at least v2.0 to extract, compressed size: 1615, uncompressed size: 2128, name: src/gfxdata.txt
3141 0xC45 Zip archive data, at least v1.0 to extract, compressed size: 1574, uncompressed size: 1574, name: src/gfxdata.zip
4738 0x1282 End of Zip archive, footer length: 22
4760 0x1298 Zip archive data, at least v2.0 to extract, compressed size: 1426, uncompressed size: 3561, name: src/oof.txt
6227 0x1853 Zip archive data, at least v2.0 to extract, compressed size: 3485, uncompressed size: 4167, name: src/unencrypted.docx
9762 0x2622 Zip archive data, at least v2.0 to extract, name: word/
9797 0x2645 Zip archive data, at least v2.0 to extract, name: word/_rels/
9838 0x266E Zip archive data, at least v2.0 to extract, compressed size: 197, uncompressed size: 531, name: word/_rels/document.xml.rels
10093 0x276D Zip archive data, at least v2.0 to extract, compressed size: 2195, uncompressed size: 3541, name: word/document.xml
12335 0x302F Zip archive data, at least v2.0 to extract, compressed size: 308, uncompressed size: 959, name: word/fontTable.xml
12691 0x3193 Zip archive data, at least v2.0 to extract, compressed size: 165, uncompressed size: 208, name: word/settings.xml
12903 0x3267 Zip archive data, at least v2.0 to extract, compressed size: 632, uncompressed size: 2384, name: word/styles.xml
15310 0x3BCE End of Zip archive, footer length: 22
```

After extracting it, we go to the folder to see the extracted content and look for the pattern `flag{` using `strings`
```
$ strings `find *` | grep flag
strings: Warning: 'docProps' is a directory
strings: Warning: '_rels' is a directory
strings: Warning: 'src' is a directory
strings: Warning: 'word' is a directory
strings: Warning: 'word/_rels' is a directory
Sed eget sem mi. Nunc ornare tincidunt nulla quis imperdiet. Donec quis dignissim lorem, vel dictum felis. Morbi blandit dapibus lorem nec blandit. Pellentesque ornare auctor est, vitae ultrices nulla efficitur quis. flag{oof_is_right_why_gfxdata_though} Morbi vel velit vel sem malesuada volutpat interdum ut elit. Duis orci nisl, suscipit non maximus sit amet, consectetur at diam. Vestibulum cursus odio vitae eros mollis sodales. Ut scelerisque magna diam, sit amet porttitor massa tincidunt tempus. Vivamus libero nulla, facilisis id faucibus sit amet, ultricies non dolor. Maecenas ornare viverra dui, nec vestibulum nisl pretium id. Nam fringilla maximus quam non porttitor. Curabitur eget ultricies metus. Nunc hendrerit dolor non nulla volutpat sollicitudin. Suspendisse hendrerit odio nec luctus venenatis. Nullam lobortis fringilla aliquam.
```

And we have the flag as `flag{oof_is_right_why_gfxdata_though}`