"for malicious purpose" is correct and usable in written English. You can use it to refer to an intentional and malevolent act or action. For example: "He spread false rumors about his colleague for malicious purpose.".
Account Hijacking (AH) is where an attack aims to hijack the user accounts for malicious purpose.
However, it may also be used to correct poor photo composition in photography competition or to remove object from image for malicious purpose.
"China has the means, opportunity, and motive to use telecommunications companies for malicious purposes," the report says.
"We currently have 2.85 million domain names and cannot exclude that individual users might be using domain names for malicious purposes".
His actions have animated the debate about so-called "cyberjacking"—the ability to take control of aircraft remotely, or interfere with aircraft systems for malicious purposes.
If an attacker gets hold of the password, via malware or other means, the compromised account can then be used for malicious purposes.
"Having people use their authentic names makes them more accountable, and also helps us root out accounts created for malicious purposes, like harassment, fraud, impersonation and hate speech.
Being a terminologist, I care about word choice. Ludwig simply helps me pick the best words for any translation. Five stars!
Maria Pia Montoro
Terminologist and Q/A Analyst @ Translation Centre for the Bodies of the European Union