Where are the PDF’s being placed? Can the TC’s actually browse anything else on that webserver? You could setup a quick APACHE server using some linux distro out there and serve up the content from that host. On your TC’s you will need to include a PDF reader in the image to open the files. FoxitReader is a good reader and seems to be leaner than Adobe Acrobat.
I already have a server. I’m having difficulty with the rendering of the PDFs on the thin clients. I notice Foxit has a Linux reader, which I will investigate.