You probably had a senior moment

(I know they are getting more frequent in my case).
OR
Did you check the CONTENT of the book?
Metadata downloads are not the most accurate things

and the VALUE may be wrong.
2017? Is this the Calibre {date} or the file date? The Calibre date is when you ADDED it to C
As to Exploits: None reported that were ACTUAL (some A/V had false positives) in the 9 Years I have been using it,
Also, none of my books contain JS (there is no real need for most books)