Northrop Grumman root certificate does not not trust?

I am running Acrobat XI (11.0.14) on Mac OS X 10.11.3

I received a signed document digitally from a reliable source to Northrop Grumman.  The digital signature is not reliable.  I clicked on the signature and saw the train of trust: Northrop Grumman Corporate Root CA - G2 > Northrop Grumman Corporate signature CA - G2 > Digital Signature of the individual

Both the root Corporate CA - G2 of Northrop Grumman and the Northrop Grumman corporate signature CA - G2 are not reliable.  Shouldn't this be trusted by default.  Is not a major Acrobat XI pre-loaded with trusted root certificates?  Isn't OS X also similarly pre-loaded?

I know that I can trust this individual for signature directly from the document, but I prefer not to do so.

Any ideas?

If you want to know about Mac OS, see lists of certificates available for OS X - Apple support trusted root

Doesn't seem to be there.

Tags: Acrobat

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