rename .jpg e-books

hey /prog/, i hope you can help me.

i downloaded >1000 e-books (.rar hidden in .jpg file), but most of the filnames consist of numbers and not the actuall book/author name. inside the .jpg/.rar file, there is the real book (.pdf, .txt etc.) with the correct name.

is it possible to rename the numbered .jpg files with the correct book title from inside the .rar file or "scanning" the name from the .jpg image automaticly?

>>3
i also thought of this, but then i'd have 1000 text and 1000 image files and i don't want to delete the book covers.

>>2
yeah, propably i won't read them all. but there are a lot of them i want to read. anyway, owning >1000 books ist just a great feeling