Chinese hacker groups are involved in cyber intelligence operations against western companies with the intent to steal critical information. Government of China is accused to systematically attacking the computer networks of the western governments and corporations. Attacks have use malicious PDF documents exploiting an Adobe Reader bug patched last month to infect Windows PCs with trojan Sykipot Symantec researchers have discovered one of the main server, the machine that phisically mantains more that 100 malformed PDF, used during the attack is located in Beijing.”]