UNPACKING JAVASCRIPT WITH AN ACTIONSCRIPT EMULATOR
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United States of America Patent
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Issued Date -
May 1, 2014
app pub date -
Nov 1, 2012
filing date -
Nov 1, 2012
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
Methods and systems for detecting an attempt to evaluate embedded JavaScript are provided. According to one embodiment, an ActionScript emulator receives a Flash file to be tested. The emulator implements a modified version of a class typically implemented by a Flash file container. The emulator reveals one or more tagged data blocks (tags) contained within the Flash file by decoding the Flash file. The emulator determines whether the one or more tags are capable of containing ActionScript bytecode (ABC) by evaluating the one or more tags. When an affirmative determination results with respect to a tag of the one or more tags, then the emulator interprets and executes the ABC associated with the tag. Responsive to invocation of a predetermined method of the modified version of the class by the ABC and meeting one or more predetermined conditions, the emulator reports existence of embedded JavaScript within the Flash file.
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