Malicious PDF — malware analysis report

Static analysis result for SHA-256 317ac41ed82408cb…

MALICIOUS

PDF

6.6 KB
MD5: b3206e60b932e6ab852c808066df08ba SHA-1: 8daec421ae307717f5250e8efbb2f6f50868f75e SHA-256: 317ac41ed82408cbc4c821bc43bb6a2077ba1bcf2e86f9cdd632948fbba41b9f
88 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell

This PDF document contains embedded JavaScript, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. The ML classifier also flagged it as malicious. The JavaScript stream, identified as stream_002_off00000327.js, likely contains obfuscated code that is executed using the unescape() function, as suggested by the PDF_UNESCAPE heuristic. The exact behavior of the script could not be fully determined due to obfuscation, but it is highly probable that it attempts to download and execute a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

Heuristics 5

  • unescape() call high PDF_UNESCAPE
    unescape() found — often used to decode shellcode in PDF JS exploits (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)
  • Suspicious extracted artifact info EXTRACTED_FILE_STATIC_TRIAGE
    One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.
  • 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off00000327.js
9b174ee31fdaf553769622dd12d4cd5e5f697f0b383e6560081a5137a05a06f8		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x327 930 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 2 eval/decoder/string-building token(s).
objstm_0024_00.bin
d520f776fd6a41445fb993f6618efc665e0d8a554d3eaf47039f69cf237f141a		 pdf-objstm-decoded PDF /ObjStm 24 0 obj (inflated) 331 bytes

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