The Secret Pdf -

Comment Pane or View > Show Markup

View > Show/Hide > Navigation Panes > Attachments The Secret Pdf

Go forth and read between the lines.

File > Properties (or Ctrl/Cmd + D in Adobe/Acrobat) Comment Pane or View > Show Markup View

Click anywhere. If a cursor appears, there's a hidden input box. Use Prepare Form tool to reveal all fields. Comment Pane or View &gt

Advanced PDFs can run scripts. To inspect: Edit > JavaScript > Document JavaScripts