Converting RGB PDF to CMYK PDF

I'm looking for a way to convert RGB PDF's to CMYK PDF for printing purposes. The RGB PDF is created by an online Flash application and I'm hoping to convert the file using Acrobat via Command line. I have tried a couple of programs e.g. PStill and PDFcreator but these just don't do the job. It's important to use the command line due to the fact that the conversion must be done automatically on a dedicated server.
Important to know is that the PDF consists of texts and images and gradients. This is a RGB example which I would like to convert. This is the CMYK output I have created manually.
Other solutions next to Acrobat are also welcome as long as they do the job

In your original message you say "the conversion must be done automatically on a dedicated server" - this implies that Acrobat is being used outside the EULA, which strictly forbids installation as a server process. Acrobat is licensed for individual interactive desktop use by one person, no other deployments are allowed.
You cannot access Acrobat's editing and batch-processing functions from the commandline at all. Adobe has server-based solutions for PDF generation  (LiveCycle ES3) but they are extremely expensive and would need work to get them to do what you're looking for. Realistically, your Flash developer needs to recode his app to output in CMYK or you will need third-party software on the server to re-fry the files. I don't know of any off-the-shelf commandline tools which can perform color conversion on existing PDFs.

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