Malicious PDF — malware analysis report

Static analysis result for SHA-256 3328384f2b9a9730…

MALICIOUS

PDF

16.7 KB First seen: 2018-04-30
MD5: 929f0471fd6badd88781a3081026d150 SHA-1: 9ce3c83a83f0618d4907a72c37ea1ec63ea2c420 SHA-256: 3328384f2b9a9730f8c8a2a4da861f0e92de20e2375fb5c909b24bd8e371dce6
60 Risk Score

Machine Learning

  • Nyx PDF Classifier clean score 0.0266

Heuristics 1

  • CoolType Type 1 Multiple-Master font overflow — CVE-2010-1797 (jailbreakme) critical CVE likely CVE_2010_1797
    PDF embeds a Type 1 (PostScript) font that carries Multiple Master Blend keys (BlendDesignPositions/BlendAxisTypes/BlendDesignMap) together with an over-long clear-text overflow filler (a giant repeated-token array, a 1 KB+ contiguous junk token, or a 'blatantly invalid' self-label). Multiple Master is a deprecated Type 1 sub-format whose Blend handling drives a stack buffer overflow in the FreeType / Adobe CoolType font parser — the static shape of the 2010 'jailbreakme' PDF font 0-day (CVE-2010-1797), the /FontFile (Type 1) counterpart to the CVE-2010-2883 SING exploit. The malicious bytes live inside a FlateDecoded /FontFile, so JS, heap-spray and raw-byte rules never see them; rendering one glyph in the font forces the vulnerable parse.

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_000_off000003eb.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3EB 414879 bytes
SHA-256: 4de8bd343c9356830e8531fbb1d5b1c000b1e4fe36a2726d171a099d74d7299d

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