If you have a Mac, the easiest way to convert PDF scripts into Final Draft files is to use [Highland](http://quoteunquoteapps.com/highland/).
A major reason we [recommend you send your script out as a PDF](https://screenwriting.io/what-format-should-my-script-be-in-when-i-send-it-out/) is that PDF scripts are not easily editable. And while that is usually an asset, it is an obvious problem if you need to edit the script.
Highland is a screenplay utility for Mac that seamlessly converts PDF screenplays to editable [Fountain](https://screenwriting.io/what-is-fountain/) or [Final Draft](https://screenwriting.io/what-is-final-draft/) files, and back again. (It’s also a text editor, so you can write your screenplay directly in Highland, too.)
Highland is [available in the Mac App Store](https://itunes.apple.com/us/app/highland/id499329572?mt=12).
It is also possible to export your PDF script as plain text (using Adobe Reader or another program) and open that directly with Final Draft. The resulting document will most likely need a great deal of reformatting, though, and will include cruft like page numbers and out of place CONT’Ds.