The documents show that EastNets, an anti-money laundering and financial services firm, had their Dubai office compromised by the NSA.
However, the company said Friday that the leaked documents were dated, and refuted claims that customer data had been affected.
In a first for 'The ShadowBrokers,' the leaked information includes PowerPoint slides and purported target lists hinting that the hacker group has access to a wider range of data than previously thought.
"This is by far the most brutal dump," said Cormae Technologies founder Matt Suiche, who has keenly followed the group's disclosures.
In a blog post, Matt, who initially helped confirm the group's connection to the NSA, said it appeared that thousands of employees' accounts and machines from EastNet's offices had been compromised.
Matt added that financial institutions in Kuwait, Bahrain, and Palestinian territories had been targeted by spies.
EastNets released a statement saying that there was 'no credibility' to the allegation that its customer details had been compromised.
The firm, which assists clients to connect to SWIFT, the world's electronic hub, said the ShadowBrokers documents referred to a 'low-level internal server' that has been put out of service.
The company added that a 'complete check' of its systems had not shown any signs of compromise.
However, the company's denial was met with skepticism from people who reviewed the leaked files.
Repeated messages asking for clarification from the company were ignored.