How to find the XY position a Specific Word on PDF Page

Dear All,

I use Acrobat Pro for my purpose. I use a small VBA Macro to split a merged pdf document. there is a word/Number (Eg. Invoice Numbers) in a specific place on every split file. I hope to use this word/Number as the file name. 

so,  please explain how to find the XY position in a Specific Word on PDF Page using Exel VBA.

Thanks,

Priyantha.