"sent image files" is an HD Radio function, and HD Radio is also known as NRSC-5, the standards document that describes it.
There's an NRSC-5 encoder floating around on Github, if you want to try your hand at it. Notably, it was implemented by an infosec firm, presumably because more garbage code like this is lurking everywhere, and it never gets proper testing because HD Radio is proprietary and its creators never intended an open-source encoder to exist. (To the point of hiding all sorts of details about the codec, but some educated guesses and comparison to similar codecs seem to have paid off.)
So, in this case it just crashes the radios so they boot-loop, but how long until someone figures out a payload that can do more damage?
There's an NRSC-5 encoder floating around on Github, if you want to try your hand at it. Notably, it was implemented by an infosec firm, presumably because more garbage code like this is lurking everywhere, and it never gets proper testing because HD Radio is proprietary and its creators never intended an open-source encoder to exist. (To the point of hiding all sorts of details about the codec, but some educated guesses and comparison to similar codecs seem to have paid off.)
So, in this case it just crashes the radios so they boot-loop, but how long until someone figures out a payload that can do more damage?