Comment by dogma1138

That's the comment at the end of the file, but is this even the challenge? Because it take takes less than 5 seconds to find it, i think this is a hint not the solution.

EDIT: Use gimp to save it as ASCII portable bitmap (https://en.wikipedia.org/wiki/Netpbm_format), strip the headers and all the junk and you get a message that links to mi5.gov.uk/careers.