Steganography

Any hint for this one?
I didn’t even manage to open the file.

view the file in an ascii editor and find something wrong in the header...

Hi I found the key and the IV into the pdf.
Now I’m going to DECIPHER the encrypted part of the file.
But... with or without the chunck? and the header? or wee need to decipher the entire file?
I’m trying everything without result :(
Could someone give me an hint?

more exactly... i take this error... is it possibile that I’m using a different version of openssl or I’m simply setting as input the wrong part of the file?

bad decrypt
6870300:error:06065064:digital envelope routines:EVP_DecryptFinal_ex:bad decrypt:evp_enc.c:531:

I guess that when openssl decripts an encrypted file, it suppose by default that the encrypted file has been written in "ciphered by openssl" format, with its file storage convention.

You may need something else than openssl to decrypt (or maybe openssl options I do not know about)
You may also find some simple python code on the internet to decipher files using the key and the IV you found