q2a-member sun hired me to create a PDF plugin. I was able to tweak it, you can download the file at http://www.q2apro.com/plugins/embed
Note: You need to hack the qa-blob.php so that the blob-pdf is served "inline" and not as "attachment". See plugin zip-file, folder qa-blob.
Hope that helps others,
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July 15, 2020: Q2A 1.8.5 released!