AUGUSTA, Ga. (CBS) -- A Georgia judge on Thursday denied bail to Reality Leigh Winner, the 25-year-old NSA contractor accused of leaking classified documents.

Wearing an orange jumpsuit and leg shackles, Winner pleaded not guilty in U.S. district court to charges that she illegally retained and transmitted national defense information. The federal crime carries a maximum penalty of 10 years in prison if she's convicted.

Prosecutors argued Winner had used a thumb drive to download classified documents while she was in the Air Force, CBS News' David Begnaud reports. The thumb drive has not been found, and U.S. Magistrate Judge Brian Epps said he was concerned since that drive's location is unknown.

Epps also said he was concerned that Winner appeared to have a fascination with the Middle East and Islamic terrorism, Begnaud reports.

"Whether that's a jest or not, it still concerns me," Epps said.

Authorities haven't described the report or named the news outlet. But the Justice Department announced Winner's arrest Monday as The Intercept reported it had obtained a classified National Security Agency report suggesting Russian hackers attacked a U.S. voting software supplier before last year's presidential election. The NSA report was dated May 5, the same as the document Winner is charged with leaking.

Prosecutor Jennifer Solari says investigators seized a notebook from Winner's house in Augusta, Georgia, and in it, Winner made references about traveling to the Middle East. At one point she wrote, "I want to burn the White House down ... find somewhere in Kurdistan to live. Haha."

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