Hallo Martin,
to be able to write to a PDF file you need some extra software that is able to create those files.
Most of those programs are installing themselves as printer drivers, so if you want to wrate a table into a pdf file you will have to create a report and print it. LabVIEW insrtalls a couple of exaples regarding report generation, online I found an example for "printing" the frontpanel screen into a PDF.
http://sine.ni.com/apps/we/niepd_web_display.display_epd4?p_guid=B45EACE3DF2556A4E034080020E74861&p_node=DZ52084&p_source=External
Ingo Schumacher
Systems Engineering Manager CEERNational Instruments Germany