The factory default login credentials for any Palo Alto Networks device is (WebGUI or CLI):
Username: admin
Password: admin
owner: jnguyen
https://knowledgebase.paloaltonetworks.com/KCSArticleDetail?id=kA10g000000ClaQCAS&refURL=http%3A%2F%2Fknowledgebase.paloaltonetworks.com%2FKCSArticleDetail