There's a expressly named pandoc-portable repository at https://github.com/pandoc-extras/pandoc-portable -- last updated in 2017-11-21, so apparently outdated. Being a CLI tool, the official pandoc release, once extracted, will expectably behave in a portable way. Note that in order to output to PDF, pandoc needs LaTeX (natively portable MikTeX is recommended).author of https://pandoc.org/ wrote:If you need to convert files from one markup format into another, pandoc is your swiss-army knife. Pandoc can convert documents in (several dialects of) Markdown, reStructuredText, textile, HTML, DocBook, LaTeX, MediaWiki markup, TWiki markup, TikiWiki markup, Creole 1.0, Vimwiki markup, OPML, Emacs Org-Mode, Emacs Muse, txt2tags, Microsoft Word docx, LibreOffice ODT, EPUB, or Haddock markup...
Download the latest pandoc release (currently v2.1.3) from https://github.com/jgm/pandoc/releases/.