Files created with some Adobe Professional applications such as Acrobat Pro ensure the file is small by excluding font information from the file. Simple pdf creation applications embed the font in the file, which makes for transportability between apps but does make the files big.
The problem i have experienced is that Adobe Reader X is one of the simple app varieties, so is unable to open, print, or read files created using Adobe Acrobat Pro..
i'd welcome any help in (a) finding a free app that opens these 'pro pdf' files, OR (b) an option setting in Acrobat Pro which includes the font information in the file - or both!