Adobe Acrobat: How to batch to combine multiple pdf files?

I have 3 folders:

Folder 1 
Folder 2
Folder 3

In each folder I have 5 pdf files:

    Folder 1 
       file1.pdf
       file2.pdf
    Folder 2
       file1.pdf
       file2.pdf
    Folder 3
       file1.pdf
       file2.pdf

I want that in each folder to have a combined file of those two files:

    Folder 1 
       binder.pdf
    Folder 2
       binder.pdf
    Folder 3
       binder.pdf

Any idea? Don't tell to do it manually. This case is just to explain you my problem. Think that I have hundreds of folders. :) Maybe I can use another tool instead of Adobe Acrobat?!