You're welcome. As for the PDF->MOBI conversion, as far as I know one of the internal MOBI file variants offered is to do exactly what you want. Basically it wraps the PDF in a MOBI container and the hardware handles the rest automatically. But I agree with Adoby that under normal circumstances you do not want to use PDF as a source document. The resulting output really is a nightmare in any other format.
IMO PDF serves only two purposes with regards to ebooks: art books and paper equivalency. You cannot adequately explain works of art through verbal or textual communication. You need imagery. Although I refer to art, these could be architectural blueprints, mechanical schematics or any other form of graphic communication.
The other matter, paper equivalency, becomes an issue when the layout and/or the exact placement of information is mandatory. Generally this is a matter of proper citation over distance. Legal documents illustrate this point as it is easy to misunderstand a particular clause. So lawyer1 can tell lawyer2: "Yes, but per clause 3, para 7, line 22, your client is..." and both lawyers can read the exact same passage to determine what the client is, or is not, obligated to.
Note that PDF might have legitimate uses in other circumstances and I'm not arguing that point.