Yeah, they're on The Guardian from when before Greenwald turned the leaks into his The Intercept venture [1]. It was one of the documents in the 2nd round of leaks about a month or so after the original PRISM and phone metadata. This presentation was the first evidence that the United States spied on State Owned Enterprises (SOEs) in addition to foreign governments.
The presentation was for analyst training, and the Petrobras intrusion was nonchalantly used as an example.
If you're just getting into learning about the Snowden leaks and NSA network exploitation, I would suggest starting from the beginning in 2013, checking out the original The Guardian articles and the NYT and Washington Post ones. Der Spiegel also received one or two leaks as well; the articles were written by Jacob Appelbaum and are fairly thorough. The Guardian and Der Spiegel articles are heavily editorialized and jump to some conclusions that were later discounted, but overall the reporting is decent.
This is interesting, I hadn't heard of this, are there any links to the slide?