Why does Firefox change the filenames of pdfs when it opens them? They go from normal names to 8-digit random letter/number sequences

When I click to open a PDF from Firefox it behaves very strangely. Instead of opening the PDF with its original filename (say for example: Report_on_the_weather.pdf) it changes the file name on opening. They open up with random 8-digit filenames (for example 5918Bd01.pdf). It does this for all PDF files. I would like to stop this behabviour. Any ideas?
My configuration:
Firefox 4
Windows XP
Adobe Acrobat 8.1 Standard (not the Reader, the full standard application)

cor-el, thanks for responding. As it turns out the machine was compromised, probably due to the Java upgade from 6.x to the supposedly current 7.x version. I suspect one of the 'always open' tabs in my profile was aimed at a site that had been compromised to exploit the java vulnerability that has not apparently been fixed yet.
After removing Java, a current Panda AV scan detected three bad jar files. Further testing with MSCONFIG found a file in startup that did not belong, turns out to be a new exploit with very little coverage on virustotal (neither Panda nor McAfee detected it as malware) but as soon as it was taken out of the startup, Firefox started working perfectly.
Firefox was the parakeet in the cave, tipping over to let me know something was wrong.
The machine is in quarantine until a much more complete analysis is done. We may still rebuild it to be certain.
I'm giving you a 'solved' on this because the windows safe mode boot pointed the way to determining the problem.

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