Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5b77fd393b1991b…

MALICIOUS

PDF

18.2 KB
MD5: e1bb8aa42ee2bf04a7bf7996cdedf87f SHA-1: 4d85de4046877d04984eee3214a8d08c249156dc SHA-256: e5b77fd393b1991b110b95a10e9bb1f97bc95d8f256f7eea0e4db13161c0189c
94 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1059.003 Windows Command Shell

The PDF file was flagged by a machine learning classifier as malicious. Static analysis revealed embedded JavaScript with obfuscation techniques including `eval()` and `String.fromCharCode()`. This JavaScript is likely responsible for downloading and executing a secondary payload, a common tactic for malware delivery. No specific family could be identified due to the generic nature of the obfuscation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9408

Heuristics 5

  • eval() call high PDF_EVAL
    eval() found — commonly used for obfuscated exploit execution (matched inside decoded stream)
  • JavaScript action low PDF_JAVASCRIPT
    PDF contains a /JavaScript action. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules. (matched inside decoded stream)
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules. (matched inside decoded stream)
  • String.fromCharCode low PDF_FROMCHARCODE
    String.fromCharCode found — used to construct payload strings dynamically. Common in benign JavaScript libraries for codepoint manipulation, so this alone is informational; weaponised use is also caught by the dedicated fromCharCode-stage and exploit-shape rules. (matched inside decoded stream)
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://ns.adobe.com/xap/1.0/
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/pdf/1.3/

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off000004a8.bin
350520b8e27ba56f6aa61773cf7f32e455af5c1c7d24474fc350bace5ebedb2b		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4A8 4796 bytes
objstm_0025_00.bin
cd0f53d9a4e28e71eba90dd8fba2226c06b41f506bda1d0aca160e49fc6bae98		 pdf-objstm-decoded PDF /ObjStm 25 0 obj (inflated) 428 bytes
objstm_0047_00.bin
d88a4a3c0504779232b0a8904ee61e668760dcf5d45810bc7c1c786c08caa47a		 pdf-objstm-decoded PDF /ObjStm 47 0 obj (inflated) 32 bytes

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