hidden
Flag: oh_shit_you_must_be_the_chosen_one
The challenge consists solely of an image from the Matrix.
Let's learn a bit more about the image by running it through file:
$ file hidden.jpg
hidden.jpg: JPEG image data, JFIF standard 1.01, comment: "flag{oh_shit_you_must_be_the_chosen_one}"
The flag is thus oh_shit_you_must_be_the_chosen_one.