Are there any OpenSource projects which will run in Linux for editing a PDF document, and specifically editing the Acrobat JavaScript within the PDF document?
I couldn't find a solution that exactly met your requirements. Hopefully, the following will provide some help.
PDFedit - http://pdfedit.cz/en/index.html
PDFedit is a free open source pdf editor and a library for manipulating PDF documents, released under terms of GNU GPL version 2. It includes PDF manipulating library based on xpdf, GUI, set of command line tools and a pdf editor.
PS The PDFedit documentation mentions scripting support but does not explicit mention Acrobat scripts.
Multi-platform PDF Editors - http://en.wikipedia.org/wiki/List_of_PDF_software#Editors
Unix and Linux PDF Editors - http://en.wikipedia.org/wiki/List_of_PDF_software#Editors_2
The Acrobat JavaScript Console (Windows) - http://acrobatusers.com/tutorials/javascript_console
The Acrobat JavaScript Console window (a.k.a. the Console window) is one of the tools included in the Acrobat JavaScript Debugger. The Console window is by far the most useful tool in Adobe Acrobat for testing and debugging JavaScript code, but it is more than just a utility for testing code. It can also execute code snippets for automating tasks in Acrobat and analyzing documents. In this article, we’ll cover setting up and using this essential tool.
If you are really desperate, you can open the .pdf file using a text editor. In all of the text you will find the field's Javascript, which you can edit and then save. It is a pain to do, but you can certainly make minor adjustments to the code in this way.
Be sure to make a copy of the original .pdf file as an archive before trying to edit it, of course.
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