Most people get stuck with identifying the encoded message in the exif image. This is completely normal as you won't find this in a real production enviroment.
What's EXIF and where do you normally encounter it?
Exchangeable Image File Format (EXIF) is a standard that defines specific information related to an image or other media captured by a digital camera. It is capable of storing such important data as camera exposure, date/time the image was captured, and even GPS location. In this instance there was a string added to the image which corresponds to a directory on the web server.