ASCII text, PDFs and Magstripe Encoding

Ok I got a challenge. We are creating pdfs via this method to use as print files. That works just great but now I have to encode a magstripe via these pdfs and I am not sure if I can get it done. I have tried everything I can find in the documentation but nothing seems to have helped. Basically what I need is to somehow get a string value into the pdf. Whether it is via the body of the pdf of some property or parameter. What I need is for the string to go into the document without being encoded into the pdf document. I have been able to accomplish this by using the string as the title or author but the string NEEDs to be terminated via a new line. Setting the string as one of the parameters causes it to have parenthasis around it. Can anyone think of another way? Thanks for your help! Ben PS. if you view the pdf via a ascii text viewer (ultraedit) you will see the lines and how the document gets encoded when it is apart of the pdf.