From the UPX web-site: “UPX is a free, portable, extendable, high-performance executable packer for several executable formats.”
By installing the UPX Unpacker package, binaries compressed with UPX are automatically identified and unpacked as child objects. PE, ELF and Mach-O binaries are all supported.
If for some reason a binary is not automatically unpacked, the unpacker can be invoked manually as an action.
Additionally, the unpacker is exposed to the SDK:
from Pkg.UPXUnpacker.Unpack import unpack ret, output = unpack(file_name) # prints the unpacker output print(output.decode("utf-8"))