Adobe PDF malware has been named as the main threat from the last quarter.

According to BitDefender, for the period July to September 2010 in the UK the PDF malware Exploit.PDF-JS.Gen was the number one malicious threat. It claimed 6.11 per cent of the total infections in the UK.

Nick Billington, managing director of BitDefender UK and Ireland, said: “Our timely quarterly study chimes with security industry experts' opinion that PDF is far from the perceived safe option and continues to be a potent threat to PC security.

“While most people understand to not open attachments or executable files in spam messages, fewer recognise and understand that PDFs can contain malicious code that exploits vulnerabilities in Adobe PDF Reader leaving the PC infected with a virus.”