@David_652
I have a question about that "Attacks" file you created - does it contain in full or in part any links, examples, code, foreign language words/phrases, acronyms, images, etc. about how attacks are designed and/or executed?
Especially any copied and referenced from online sources.
Noted the reference to macros - did you include any macro examples or otherwise use some macro when writing the document?
Search your Word folders for any macros. E.g. the template link posted by @USADRet.
What about overall formatting: special characters and codes used to create the document?
Overall consider that that some bit of content may be triggering the blocks.
Something in the document that is being erroneously interpreted as a macro....
Make a copy of the file, edit out any potential culprits, and start adding them back one by one.
Determine if: 1) the blocking stops, and 2) what, if anything, causes the blocking to re-occur.
Start with Pages - will Page 1 as its' own document open without triggering a block?
You could edit out full paragraphs to determine if one particular paragraph or another is the culprit.
Then, if so, work through the sentences within a given paragraph.
And also configure the document to show all hidden characters, formating etc..
Remember to check headers and footnotes.
Another link:
https://learn.microsoft.com/en-us/office/troubleshoot/word/autoexec-autoopen-macros-word
Do some macro "testing" per the link on a new document. Does the new document get blocked etc.?
Reverse engineering....
Just some passing thoughts.