Suspicious server as updater for Adobe program?

[RoboMan]

I was surfing on the web when suddenly ESET noticed me of a strange event. Adobe Acrobat Updater was trying to open a connection to an unknown server: ocsp.digicert.com. Used to known servers to update and after the CCleaner incident paranoia, i decided to block the access and google. Apparently, on the web they say this OCSP is a protocol related to certificates. VirusTotal throws 0 detected threats but community there voted all negative. If you visit the aforementioned server, it automatically downloads a file that i uploaded to VT and again threw 0 detected threats but has a community score of -188 (negative).

Anybody knows anything about this? Can anybody clarify a little if you have knowledge on the subject?

VT link to downlaoded file: VirusTotal

VT link to host scan: VirusTotal

 

[roger_m]

They have some information about themselves on their website, and a review I found.
SSL Digital Certificate Authority - Encryption & Authentication
DigiCert SSL Certificate Reviews

It would seem that they are legit and they were established in 2003.