Specify one word to modify in many pdf file at once

Good evening,

I have a hundred pdf files that all start with the same page.

I have a word to modify in this page that exists in these pdf files.

The word is "EXE"

I can't use the replace option because it changes all the words that contains these 3 letters in this page.

So I need a tool to let me specify for him what word I need to change.

Is there a way to do so?

Regards