I have an ebook that was compiled in the Windows based "exe." format.
In this ebook, I use JavaScript to display randomly selected banners
and to track usage.

What I am interested in knowing, is whether I can get the same
functionality if I use a "pdf" format instead of the "exe" format. In
other words, do pdf file support JavaScript?

Hi codehead1953,
Yes, JavaScript is supported in Adobe PDF documents.  From the Adobe
SDK information page on PDF documents located at
http://partners.adobe.com/asn/tech/pdf/acrobatsdks.jsp#javascript:

"JavaScript support
One of the easiest and most powerful ways to customize PDF files is by
using JavaScript. Based on JavaScript version 1.5 of ISO-16262
(formerly known as ECMAScript), JavaScript in Acrobat implements
objects, methods, and properties that enable you to manipulate PDF
files, produce database-driven PDF files, modify the appearance of PDF
files, and much more. You can tie Acrobat JavaScript code to a
specific PDF document, a page, field, or button within that document,
or a field or button within the PDF file, and even to a user action.

JavaScript is particularly useful for PDF/XML forms. JavaScript
enables automated forms handling, Web and database communication,
commenting, and user-interface capabilities. PDF files created with
Acrobat and Adobe server products allow data to be extracted as XML
into custom schemas. Applications written in Java & other languages
easily integrate Acrobat with Web Services using Simple Object Access
Protocol (SOAP)."


There are several JavaScript scripting references and guides available
from Adobe at http://partners.adobe.com/asn/acrobat/docs.jsp#javascript:


Acrobat 6:
Acrobat JavaScript Scripting Reference
04/2004 (PDF: 2.28 MB / 416 pages)
http://partners.adobe.com/asn/acrobat/sdk/public/docs/AcroJS.pdf

Acrobat JavaScript Scripting Guide
05/2003 (PDF: 1.06 MB / 90 pages)
http://partners.adobe.com/asn/acrobat/sdk/public/docs/AcroJSGuide.pdf
(links to test debuggers available from the index page mentioned above)

Programming Acrobat JavaScript Using Visual Basic
05/2003 (PDF: 180 KB / 14 pages)
http://partners.adobe.com/asn/acrobat/sdk/explodedSDK/Documentation/JavaScript/VBJavaScript.pdf

Multimedia JavaScript Reference
04/2004 (PDF: 776 KB / 125 pages)
http://partners.adobe.com/asn/acrobat/sdk/explodedSDK/Documentation/JavaScript/AcroJS-MM.pdf

Acrobat 5:
Acrobat JavaScript Object Specification
(PDF: 1.79 MB / 298 pages)
http://partners.adobe.com/asn/developer/pdfs/tn/5186AcroJS.pdf

Search Strategy:
pdf reference, clicking on first link to "Adobe Solutions Network |
Adobe PDF - Specifications" and then clicking on the heading
"Javascript"

If you have any questions, please post a clarification request before
closing/rating my answer and I'll be happy to reply.

Sincerely,
Andyt-ga

Great answer. Saved me a lot of time. Thanks.