I believe the reason for PDF not working with UTF-8 content is that when the PDF module was added (some time ago now) the original code did not support UTF-8.
Now, I do not think that this has changed at all. I would like it to support UTF-8 (UNICODE)
I do not remember seeing this being recoded so I think that you will not be able to get this working. As suggestion might be to take the OpenOffice.org export and then run that through a PDF generator. This may give you more luck.
I hope this helps
Tony
Tony Wood : twitter.com/tonywood
Vision with Technology
Experts in eZ Publish consulting & development