You downloaded the source files. The binary files are in a zip file. Or, if yoyr have Ant and the 5.0 JDK (or even 1.4.2), you can go to the build directory and run the build.sh script. The binary version then appears in build/output
Oops, I forgot, you don't need Ant, it comes with JBoss. All you need is the JDK. Also, the build takes about 8 to 10 minutes.