I would like to be able to insert into an org-buffer the text extracted from a pdf file. PDF-Tools (https://github.com/politza/pdf-tools/) provides some excellent tools for doing this.  I've written (well, msotly stolen) a defun that finds all my highlights and returns them in the form of an org heading:

(defun pdf-annot-export-as-org-heading (pdfpath)
  "Acquire highlight annotations as text, and insert into existing buffer as org heading"
  (interactive)
  (let ((outputstring "")
   
        )
    (save-excursion
      (find-file pdfpath)
      (let (
            (annots (sort (pdf-annot-getannots nil (list 'highlight)  nil) 'pdf-annot-compare-annotations))
            (filename (format "%s.org"
                          (file-name-sans-extension
                           (buffer-name))))
        (linktext (concat "[[file://" (buffer-file-name)
                          "][" (file-name-sans-extension (buffer-name)) "]]" )))
      (setq outputstring (concat "** " (file-name-sans-extension (buffer-name)) "\n\n"))
 
      ;; (insert (concat "#+TITLE: Notes for " (file-name-sans-extension filename)))
      ;; (org-insert-heading-respect-content)
      ;; (insert (file-name-sans-extension filename))
      (mapc
       (lambda (annot) ;; traverse all annotations
         (message "%s" annot)
         (let ((page (assoc-default 'page annot))
               (text (assoc-default 'subject annot))
               )
           ;;(insert (concat "\n" text " (" linktext ", " (number-to-string page) ")\n"))
           (setq outputstring (concat outputstring text " (" linktext ", " (number-to-string page) ")\n\n"))
           )
         )
       annots)
      ))
    ;;(write-file filename t)
    outputstring
    ))

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