There are many PDF to 'XYZ' output 'scanning software' available.
For example:
http://www.musitek.com/
While this doesn't necessarily help you, it is possible that the people
using Finale have something like this that they use for other non-Finale
Scores but have failed to mention to you.
A very quick google also comes up with this
http://www.finaleforum.com/forums/viewtopic.php?p=10782
So it seems that Finale may have some PDF import functionality already.
James
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