How to deobfuscate javascript?

Question

JavaScript

Hello! A long time ago, he kept malicious code. Today I remembered about it, but I still don’t understand what is written there.
Here is the link: pastebin.com/ntQb9dCs
The above 2 lines are the contents of the original js file. Below is an attempt to decipher it.
Maybe it's completely unrealistic? What do you think?

Answer 1

Didn't understand. How can the first line be the "original" js if it is also used in the decoded js.
What is the actual original file?
Something you don't agree on!

Answer 2

A minimum knowledge of JS is required and the issue will be resolved by itself.

Answer 3

Replace eval in the last line with console.log and see what it prints to the console