I am not sure what you mean by "running ant script in JBoss".
What does ws_ant.bat do?
If you download the JBoss source, there is a build/build.xml and build/build.sh and build/build.bat. The later two are scripts that run Ant using build.xml to build JBoss itself.
If you are looking for a pre-configured Ant build script to use to build your own EJBs, applications, or services that use JBoss, there is no such script.