[koolba]

> That malware played a higher pitch sound than can be heard by the human ear.

That should be "... can not be heard ..." right?

Also, do you have a link with more details.

[wccrawford]

No, it's right as-is.

[koolba]

Ah I think I read the "higher" as "high" and misunderstood it.

[jstanley]

That still doesn't really make sense. I think you misread "than" as "that".

[Tushon]

"a higher sound than can be heard" or "played a sound, which cannot be heard due to its pitch"

would both work, but your interpretation isn't correct.