English

Noun

unpacker ‎(plural unpackers)

1. One who, or that which, unpacks.
   • 1977, House & Garden (volume 149, page 168)

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

2. (computing) A software program that decompresses code or data.
   • 2007, David Harley, AVIEN malware defense guide for the Enterprise (page 408)

     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.