É um OID , não números aleatórios.
De acordo com a wikipedia:
Extended Validation certificate identification
EV certificates are standard x.509 digital certificates. The primary way to identify an EV certificate is by referencing the Certificate Policies extension field. Each issuer uses a different object identifier (OID) in this field to identify their EV certificates, and each OID is documented in the issuer's Certification Practice Statement. As with root certificate authorities in general, browsers may not recognize all issuers.
No caso deste OID:
VeriSign 2.16.840.1.113733.1.7.23.6 VeriSign EV CPS v. 3.3, p. 87