Save a PDF from another server to my server

I have a URL to a server that provides me a PDF. I wish to save that PDF to my server, when a script is called. When the query string is altered, the PDF that is downloaded is changed. My server is a Linux server, with PHP installed. The URL that I have to access this PDF is: "[login to view URL]" This URL performs a redirect and that URL performs another redirect to a page that has the PDF, as an attachment. Please view the headers of the above URL before bidding on this project. Deliverable for this project: A script in an uncompiled language, suitable for a Linux server that will access the above link and save the resulting PDF, without the use of a client machine or any intervention.