I see what you’re saying there, your Mac file size is giant! I’ve only got a PC here and I print using the CutePDF printer driver which exports similar to your file, in a note font (vectors/fonts I presume) rather than one single image, thus a small file size. Does the Mac use a printer driver too? Could it be something to do with the PDF generator rather than Cubase?
In CutePDF I can reduce the file size by compressing the images (JPEGS), would this help you?
Mike.