PicoCTF - JSut Duck It Up

April 15, 2017

What in the world could this be?!?!


Wow, that's an really strange and huge file. Title of the challenge suggest that it may be connected with JavaScript, so let's do an quick google. After a little bit of fiddling, I've found this: JSFuck. It is an esoteric subset of the JavaScript language that uses only six distinct characters in the source code. The characters are +, !, (, ), [, ].

Pasting this code into the text field, and running it produces an alert.

JSFuck alert

Easy 100pts, right? Great challenge!


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