First, make sure to use a version of JEB that allows loading third-party back-end plugins (currently, JEB Pro).
.PluginsFolder
[jeb_base_folder]/coreplugins
.lib/
within the Plugins folder.Start JEB. This line should appear in the console log: Plugin loaded: class com.pnf.plugin.pdf.PdfPlugin
Open a PDF file; the PDF plugin will detect it and analyze it as such.