I have a pdf file that I am putting on a website for a client. It is located here...
http://www.optiphysicaltherapy.com/dev/wp-content/uploads/2014/02/OPTI_NewPatientForms.p
Whatever was on that link, I did it opening the PDF with a hex editor (HxD) and searching Title, so I found /Title (untitled) somewhere and just edited it (changed the value between parentheses, here untitled).