The Malicious Egg is a special egg found in Egg Hunt 2014. It would disguise itself like another egg (usually the Mercurial Egg). Once "collected" it will turn into the Malicious Egg and about 10 Minions will spawn. After killing the Minions with your weapon, the Malicious Egg will be able to be collected.
Find a random egg and hope it is the Malicious Egg.
The real difficulty comes in finding the correct egg.
Featured Egg History
The Malicious Egg won Featured Egg of the Week from 12/17/18 to 12/23/18