### Comment:
How can malware be hidden within legitimate files?

### REPLY:
Malware can be hidden within legitimate files using various techniques. One method is through file encryption, where the malware is embedded within a legitimate file and encrypted to avoid detection. Another technique is file compression, where the malware is compressed along with legitimate files to make it harder to identify. Additionally, attackers may also use file obfuscation techniques, altering the file's structure and code to make it difficult for antivirus software to detect the malicious code.