unpacker

plural unpackers

1. One who, or that which, unpacks.

   One great advantage of professional unpacking is that the unpackers take away all the wrapping and cartons […]

   1977, House & Garden, volume 149, page 168

2. computingA software program that decompresses code or data.

   All packed malware consists of the unpacker code and packed data, which typically look like random data. The benefit of packed malware, from a malicious author's point of view, is that it cannot be analyzed until it is properly unpacked.

   2007, David Harley, AVIEN malware defense guide for the Enterprise, page 408