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The MP3 audios are not Attachments, they don't show up on Adobe Acrobat Pro DC's Attachments panel, they show up on the Comments panel and Adobe Reader/Acrobat can only export them to an Adobe .fdf file which is a data file like pdf.

Unfortunately, PDF files can't be opened as Archives, to extract files from them.

So how can I extract the MP3's? Any free Linux or Windows software that can do this easily?

I have tried these program's free trials, they either only show the comments (can't even play them) or just export to .fdf or not event able to show comments or only extract attachments and images:

  • Ashampoo PDF Pro 2

  • Code Industry Master PDF Editor

  • Foxit Advanced PDF Editor

  • Nitro PDF Pro

  • Systools PDF Extractor

All latest versions as of 09-oct-2020

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  • If all else fails, play them while recording audio, e.g. with VLC.
    – DrMoishe Pippik
    Commented Oct 6, 2020 at 21:47

1 Answer 1

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They are sound annotations. If you do not mind working with some low level PDF tools, such as XFINIUM.PDF Inspector: https://xfiniumpdf.com/xfinium-pdf-inspector/xfinium-pdf-inspector-overview.html, you can navigate the tree of PDF objects to extract the desired stream.
You can post a sample PDF file and I can show the path you need to navigate in order to get the mp3 data.

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  • PDF > Root > Pages > Kids > Kids > Annots > Annots > Sound > obj But even after saving, the binary file that is saved is not a media file and can't be played with any media player.
    – Shayan
    Commented Oct 9, 2020 at 9:53
  • mediafire.com/file/pvw1s3xtnvr8ynv/…
    – Shayan
    Commented Oct 9, 2020 at 9:55
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    The data in sound annotations is raw sound data playing at 11025 samples per second.
    – iPDFdev
    Commented Oct 9, 2020 at 11:53
  • Were you able to successfully extract the 3 audio annotations from the PDF file I linked and play them back with VLC or your favorite media player?
    – Shayan
    Commented Oct 9, 2020 at 12:29
  • 1
    Sound annotations include raw sound data, not MP3 files. The data can be extracted but it cannot be played directly with VLC or other media player.
    – iPDFdev
    Commented Oct 9, 2020 at 12:53

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