Why Is Malware So Pervasive?

Malware, short for malicious software, an umbrella term used to refer to a variety of forms of hostile or intrusive software. Malware is defined by its malicious intent, acting against the requirements of the computer user - it does not include software that causes unintentional harm due to a deficiency.

Why Is Malware So Pervasive?

Commercial software typically has between twenty and thirty bugs per thousand lines of code. The increasing complexity of programming provides ample opportunity for hackers by way of errors and software bugs. Apollo 11 (1969) Guidance Computer contained 145,000 lines of code.

Meanwhile:

Microsoft Office 2013 has 45 million lines of code.
Hadron Collider has 50 million.
The average car requires 100 million.

The AV-TEST Institute registers over 390,000 new malicious programs every day new variants of malicious software that arrive on the scene, daily.

Associated reading:

What is malware - part 1
What is malware - part 2
What is malware - part 3