The private key is encrypted so if it's a blockchain wallet file then it ought to be one of those wallet.aes.json files that look like this:
{
"ct" : "xyz",
"iter" : 10000,
"adata" : "",
"salt" : "xyz",
"cipher" : "aes",
"ks" : 128,
"v" : 1,
"mode" : "ccm",
"iv" : "xyz",
"ts" : 64
}
Which does not match the format of this file and so it's not a blockchain.com wallet.
Anyway it looks like it's doing 2000 rounds of PBKDF2-SHA256 (or maybe PBKDF2 with 2000 rounds of SHA256 hashing?
) to encrypt the private key with a password, so maybe there's a script or utility that can decrypt this private key without the wallet software.