yes, it is, why not - with chroot and LD_LIBRARY_PATH you can “install” nearly all applications without real installation :). All what’s needed is the configuration file avastengine.conf (in /etc globally, or in your home directory), the library libavastengine-4.so (set LD_LIBRARY_PATH to the directory where it lies), the 400.vps file (location specified in avastengine.conf as Avast4DataDir), and the binary itself (avastcmd - part of avast4server package, there’s also manpage, if you don’t like -h ;).
just get the 400.vps file, and “plug it in” using avastvpsreload. this task can be automated by avastvpsupdate.pl or avastvpsupdate.sh scripts, have a look at them.