Is there a script that will increase the page size of the first page of a batch of documents?

Ideally I'd like to setup an action that will add a few lines of white space to the first page of multiple documents at a time.

I am hoping to increase the page size to add a footer text / image that includes the filename and some other information. I used to be able to use the Crop tool to increase the page size, but that doesn't seem to work now and i'd like to be able to set it up as an action.

I am probably not explaining this as well as is needed but hopefully someone can help me get on the right track.

Thanks!