http://partners.adobe.com/public/developer/opensource/index.html#js
In some Adobe products, Adobe uses a modified version of the open
source SpiderMonkey code. Use of that source is subject to the Mozilla
Public License Version 1.1 (the License). You may obtain a copy of the
License on the Mozilla website or in the download files.
Visit the Mozilla website for more details about SpiderMonkey and how
to download the source to it.
In compliance with the requirements of the License, Adobe Systems
Incorporated makes the modified version of the source code available
for download.
Download files modified (ZIP: 360k)
http://www.adobe.com/products/eula/third_party/acrobat/9/mozillamods/MOZILLA_LIB_MODS_Acrobat9.zip
i have yet to check this out ...
-- jose