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Obviously, because nobody can use the command line any more, there are online tools to do the job for you, but I haven't tried any of them to see which ones actually work. Try some of the results from https://www.google.co.uk/search?q=extract+audio+from+pdf
Yes. I can't remember how just now, but I know I've done it before, it involved a command line tool for tearing pdfs apart into their constituent files