A creator known as [PortalRunner] has engineered a single file that can function as six different file types simply by changing its extension. This is possible because file extensions are merely suggestions for the operating system; the actual content is interpreted by software based on the file’s internal headers.
Key Findings and Method
The core of this hack involves meticulously merging the headers of multiple, non-conflicting file formats into a single file. By combining the headers and then lumping together the data for each format, the file can be correctly read as a PNG image, MP4 video, PDF document, ZIP archive, Powerpoint presentation, and an HTML webpage. The success of this method depends on the flexibility of the file formats, as some, like GIF and PNG, cannot be combined because they require mutually exclusive data at the very start of the file.
Conclusion
While this ‘polyglot’ file has limitations and may not work with all software, it serves as a fascinating demonstration of how file formats are structured and interpreted. It highlights that the file’s internal structure, not its name or extension, dictates how it is processed. The project is presented as a clever technical feat rather than a tool with a specific practical application.
Mentoring question
Beyond the technical novelty, what potential security vulnerabilities or creative applications could arise from files that masquerade as multiple formats depending on how they are opened?
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