acrobat reader advanced search error skips files

Acrobat Reader is not an Apple product. Preview is an Apple product.

Have you contacted Adobe support:

https://helpx.adobe.com/support.html

or Adobe Communities:

https://community.adobe.com/t5/acrobat-reader/ct-p/ct-acrobat-reader?page=1&sort=latest_replies&lang=all&tabid=all

I believe you will get the best help in either of those two venues.

Personally, I would use Apple's Spotlight to identify specific features of a given PDF such as name, page count, creation date, keywords, Finder tag, and single or quoted multiple word passages in the PDF, etc. Then open that qualifying PDF with Adobe Reader.

Why Acrobat Reader is identifying some PDFs as damaged and Apple's Preview opens them is opposite of what I would expect, and would be a conversation with Adobe or a post in Adobe Acrobat Reader Community forum.

Just now tried Acrobat Reader DC in Sonoma, crazy, I don't think it searches for anything, or I can't figure out how‽

But Apple's Preview search fine & easy. :)