Palo Alto Networks announced a new acquisition that the cybersecurity provider expects will give it an edge in fending off online hackers.

The company is paying out $800 million to add to its portfolio Expanse, a San Francisco-based internet monitoring company that Palo Alto Networks CEO Nikesh Arora said will bring a new outside perspective to network security.

"They actually have visibility from the outside. Most security is inside out," Arora told CNBC's Jim Cramer Monday in an interview on "Mad Money." "They've spent four or five years building the capability, creating that capability from the outside."

Expanse, through what's known as an attack surface management platform, collects online information to lower the risk of cyberattack by analyzing data through the eyes of hackers, finding weaknesses that can be mitigated before exploited by outside actors. Arora said the new acquisition, which is expected to close by the end of January, will provide an additional perspective to give companies a comprehensive secure operation.

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