Found this which didn't help, but could be a useful reference in the future...

OpenSSL Convert PEM
Convert PEM to DER

openssl x509 -outform der -in certificate.pem -out certificate.der

Convert PEM to P7B

openssl crl2pkcs7 -nocrl -certfile certificate.cer -out certificate.p7b -certfile CACert.cer

Convert PEM to PFX

openssl pkcs12 -export -out certificate.pfx -inkey privateKey.key -in certificate.crt -certfile CACert.crt

OpenSSL Convert DER
Convert DER to PEM

openssl x509 -inform der -in certificate.cer -out certificate.pem

OpenSSL Convert P7B
Convert P7B to PEM

openssl pkcs7 -print_certs -in certificate.p7b -out certificate.cer

Convert P7B to PFX

openssl pkcs7 -print_certs -in certificate.p7b -out certificate.cer

openssl pkcs12 -export -in certificate.cer -inkey privateKey.key -out certificate.pfx -certfile CACert.cer

OpenSSL Convert PFX
Convert PFX to PEM

openssl pkcs12 -in certificate.pfx -out certificate.cer -nodes

@Dashrender said in When Anti-Virus Companies Get Hacked: Symantec, Trend Micro, and Intel McAfee:

I can't recall if the bad ccleaner was signed or not?

Even if it was, that would be a Microsoft compromise. This is about the AV vendors getting hacked.