Convert colors to CMYK with Acrobat X or XI

Hi everybody, it looks like Acrobat is very limited in the scriptable tasks. i’m looking for any idea to achieve what I want to do. It is pretty simple…

I want to open a PDF, convert colors to CMYK using a predefined ICC Profile, close and save that PDF.

Is there a way to do that even if it’s not with Acrobat?

I have a lot of these to convert everyday and I would like to automate that task as much as possible.

Thanks for any suggestions.