Have not had occasion to contact QuickOffice support since their being taken over by Google, whom obviously have little enthusiasm for promoting Symbian OS anymore:http://help.quickoffice.com/
If only a small .pdf you could try:-
1) Download International (9.4) (11.3 MB) from this link:http://sourceforge.net/projects/alternatedjvu/file
2) Decompress .zip folder and select AlternateReader S9.4 1.08 (4) Release International.sisx
3) Send to C5-03 by Bluetooth (will arrive in Messaging > Inbox) or connect it to PC in "Mass storage" mode and drag it onto phone.
4) Either tap on "Message" or find file on C5-03 by going to Menu > Applications > Office > File Mgr. > find file and tap on it.
As currently writing this on a Mac haven't given you instructions to install via Nokia Suite installed on your PC and bear in mind that you may need to reset date upon C5-03 to between 27/06/2010 > 27/06/2011 to allow installation as Symbian certificate has expired upon this application.