Report Library: how to automatically/programatically populate custom columns?

Hi, We've got a reporting engine on a remote machine that produces ~1k pdfs/day. Each of these has certain characteristics that we'd like to stuff into custom columns in the Report Libary to facilitate easier user browsing. ie. These are mutual fund reports, so things like fund-code, manager, $, etc.

Is there a way to externally push a pdf to the repository and populate the columns with the bits we want I'm thinking of a bat script from the remote machine to copy the file and set the attributes... how would you go about this (we're Sharepoint newbies...) Of course the other route is a BDC and a grid with the info and a link to the pdf, but we're not sure that's the best first step.

thanks