Originally published at: http://www.howtogeek.com/171993/macros-explained-why-microsoft-office-files-can-be-dangerous/
Microsoft Office documents containing built-in macros can be dangerous. Macros are essentially bits of computer code, and historically they’ve been vehicles for malware. Luckily, modern versions of Office contain security features that will protect you from macros.
But, if I download a file containing a malicious macro, won't my virus software (eg, Windows Security Essentials) detect a malicious file? If so, why do I need to restrict myself within Office?