Unpacking.UnpackObject documentation states that this method can throw UnpackException and MessageTypeException, but it also throws several other unexpected exception types:

• InvalidMessagePackStreamException
• MessageNotSupportedException
• OverflowException

You can run the following code to reproduce it (the path variable should contain the path to one of the extracted files from the attached archive):

using (var file = File.OpenRead(path))
{
  Unpacking.UnpackObject(file);
}

Found via SharpFuzz.