The icon for that iCook program that's associated itself with JSON files, is a bright shiny red apple. If you don't know what "iCook" is then it probably shouldn't be there - and it may be indicative of something you'd rather not have.
The json file in the library is not the only json file that calibre uses, there are several in the config directory, some plugins create them too. if iCook can read json files, it can probably write them too.
I would run some standalone malware scanners such as MalwareWareBytes, Trend Micro Housecall, McAfee Stinger etc
The CEO of Apple is Tim Cook. No... I'm not blaming Apple, malware writers and distributors have a warped perspective on life.
BR
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