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Because the inclusion of JavaScript in the "AcroForms" (http://en.wikipedia.org/wiki/PDF#AcroForms http://en.wikipedia.org/wiki/PDF#AcroForms) feature means PDF
by unwind 16y ago
Because the inclusion of JavaScript in the "AcroForms" (http://en.wikipedia.org/wiki/PDF#AcroForms http://en.wikipedia.org/wiki/PDF#AcroForms) feature means PDF has scripting. That's the literal answer, not sure if your comment was rhetorical or not.