rageagainstthecage is a root exploit via a fork bomb.
It IS a potentially malicious payload, BUT it is being used with owner's consent to root the phone.
The DreamDroid malware use exactly same payload - they are trojans, but this is a helpful tool.
It IS a dangerous tool in the wrong hands, but this is a root exploit, so you should exercise common sense and a little understanding of what it does and how it works.
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