悪あく玉だまハッカー

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Meanings

1

noun

A hacker who uses their skills for malicious or illegal purposes, as opposed to a 善玉ハッカー (white hat hacker).

bad, vice, rascal

玉jewel, ball

善ぜん玉だまハッカー
善玉ハッカー is a white hat hacker who uses hacking skills for ethical purposes, while 悪玉ハッカー is a malicious black hat hacker.
ハッカー
ハッカー can refer to any skilled computer enthusiast, but 悪玉ハッカー specifically denotes a malicious hacker.

Compound of 悪玉 (bad guy, villain) and ハッカー (hacker), likely a calque from English 'black hat hacker'.