The security perils of PDF files have been further highlighted by new research illustrating how a manipulated file might be used to infect other PDF files on a system.

Jeremy Conway, an application security researcher at NitroSecurity, said the attack scenario he has discovered shows PDFs are "wormable". Computer viruses are capable, by definition, of overwriting other files to spread. Conway's research is chiefly notable for illustrating how a benign PDF file might become infected using features supported by PDF specification, not a software vulnerability as such, and without the use of external binaries or JavaScript.

The "wormable PDF" research comes days after another security researcher, Didier Stevens, showed how it was possible to both embed malicious executables in PDFs and manipulate pop-up dialog boxes to trick victims into running a malicious payload. Both Adobe and FoxIT are working on a fix against the security shortcomings in their respective PDF viewing packages illustrated by the research.

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"I chose to infect the benign PDF with another, and launch a hack that redirected a user to my website, but this could have just as easily been an exploit pack and or embedded Trojan binary," Conway explains. "Worse yet this dynamic infection vector could be utilised to populate all PDFs for some new O-day attack, thereby multiplying an attackers infection vehicles while still exploiting user systems ('worm-able')."