find ./ -iname "*.html" -type f -exec sh -c 'pandoc "${0}" -o "${0%.html}.md"' {} \;

I'm now trying to convert all pdf in a folder to Markdown using a similar approach:

find ./ -iname "*.pdf" -type f -exec sh -c 'pandoc "${0}" -o "${0%.html}.md"' {} \;

All that happens when I trigger the same for pdf conversion is terminal then says:

dquote>

The PDF isn't converted to Markdown. I'm a terminal/Pandoc newb so maybe it's different for PDF? I have installed Mactex using Brew install librsvg python homebrew/cask/basictex

Do I have to do a full pdflatex install, or is there a better formula here? Thanks!