I would like to associate a PDX search catalog file with a PDF document.
Apparently there is currently no library that supports this out of the box, so what I have to do is manipulate the `/Search` entry in the document directly.
I know next to nothing about the PDF standard, so a library I can access from .NET code that would encapsulate most of the details for me would be great.

This is what the structure looks like:
[![PDF structure](https://i.stack.imgur.com/wBmKx.png)](https://i.stack.imgur.com/wBmKx.png)