From the attached image, I think you are trying to open a “binary” file inside Obsidian. You haven’t mentioned what you are trying to open. Is this an MD file or something else?
However, the first line with AES/CBC/PKCS7Padding also suggests that this could be an encrypted file.
AES in CBC mode with PKCS7 padding is a standard encryption scheme.
My blind guess is that you’re trying to open Java 
file.
Cheers, Marko 