Adware:Adware (or spyware) is a small program that is designed to show advertisements (in various form and degrees of intrusiveness) on your computer. It often reports personal information back to its owners. As a result your sense of privacy can be violated.
Packer.Malware.NSAnti.J is a spyware tool used basically by malware creators. They use Packer.Malware.NSAnti.J to hide malware contents and to bypass anti-virus protection.
Technical details (How to remove Packer.Malware.NSAnti.J(pop up))