You can see a mouse cursor in the video. Someone is manually zooming in and following the plane, likely while reviewing the footage.

Not to defend it, but it looks like at least two of them have a badge hanging around their neck.

The spec is fairly complex. Someone ported Doom to PDF, for what it’s worth.

That doesn’t make PDF an inherently dangerous filetype, but I’d say it increases the likelihood of bugs/zero days within the PDF viewer.