Somewhere I have a CD with an image processing application such as PhotoDelux. When this App was installed and setup there appeared in the list of printers the Acrobat Writer option.
In other words, a document could be printed to a PDF file.
I never used it so don't know what limitations there were, but if you care to e-mail me with a proper e-mail address and you don't mind receiving large files as e-mail attachments, I'll see what I can do about finding it and sending it to you.
No problem with copyright or licence as I got the software with a printer that I no longer use and do not use the Program myself.