Ah. You're misunderstanding what a PDF is.
There is no such thing as a "608 pixel PDF" unless the PDF has first been destroyed by being broken up into pixels. Before you bring the PDF into GraphicConverter, it is not made of pixels at all. It can not be 608 pixels because there are no pixels in it.
There are two kinds of computer graphics: "vector" graphics and "raster" graphics. Raster graphics are just like tile mosaics. Every tile is a "pixel."
Vector graphics are made of mathematical descriptions of curves, lines, and shapes. They're not made of pixels at all, and as such they have no pixel dimensions.
GraphicConverter is incapable of working with vector images. When you make a PDF in Word, it is a vector image; it's not made of pixels. As soon as GraphicConverter touches it, GraphicConverter breaks it up into pixels; in the process of doing this, it destroys text (the text is turned into pixels) and it removes everything that can not be described in pixels (which is why links, annotations, and so on are removed).
You will need to find out if your CMS can accept vector PDF files that have no pixel dimensions.
