Unique Watermark per PDF

I have a directory of uniquely named pdfs as well as a directory of uniquely named watermark images. For example..

.\directory\AB-1234.pdf          .\watermarks\AB-1234.png

.\directory\AB-1478.pdf          .\watermarks\AB-1478.png

.\directory\BD-5412.pdf          .\watermarks\BD-5412.png

Is it possible to watermark batch process each page of the pdfs with their corresponding watermark using javascript or any other automation process? I'm using an outdated version of acrobat 8. Any help would be appreciated. Thanks