just seems to be an invalid CIA file. my guess is that if you were to run GodMode9 and try doing any operations you can normally do on a CIA file (mount, rename, encrypt, etc...), you wouldn't be able to because i've had a problem like this before too. does the source you obtained the CIA from have any hash you can use to check against this file? it's probably redundant to check and you'll probably have to just re-download, but if GodMode9 lets you do those operations or if the hash matches then something bigger is at play.