Here are the instructions that PhORCAS gave me for PDFs:
Downloading the PDF Generator
1. Google "pdf995" (should be first search result)
2. Select "download now"
3. Download both the "Pdf995 Printer Driver" and the "Free Converter"
Uploading a file using this
1. Click File, Click Print.
2. Select the drop down box for "Name" and select "PDF9995"
3. Select ok (this will not print it)
4. Save the file with a new name – Do Not click on any buttons on the pop up
that will appear. Let it run it's process.
5. Upload new file
If you do anything to the file after you've converted it (adding an electronic signature), you'll have to convert it again using the above steps. That should work. Good luck!