The rapid development of Internet introduces a new set of challenging problem regarding security. To prevent unauthorized copying of digital production from distributing is one of the significant problems. Digital watermarking is a potential method for protecting the ownership rights on digital audio, image and video data. An attack succeeds in defeating a watermarked article if it impairs the watermarking information beyond acceptable limits while maintaining the perceptual quality of the attacked article. Namely, attacks on digital watermarked article must consider both watermarking information survival and the distortion of the attacked stego-media. Current attack benchmarks do not exploit as much knowledge of the watermarked image as possible, also they do not consider the distortion of the attacked stego-media. In this paper, various attacks on digital watermarking have been investigated, and a categorization of different attacks was roughly given; Besides, an Eigen-image-based (ED-based) attack is proposed to deliberately impair the watermarking information without excessively distorting the attacked stego-media, that is not currently included in those benchmark tools.