Malicious PDF — malware analysis report

Static analysis result for SHA-256 6edb32282d7a57bf…

MALICIOUS

PDF

6.4 KB
MD5: b751bdb6391c97214bb7116f658e7054 SHA-1: aa7d4b0fd4106efa4ef856df194a255bb4eecab1 SHA-256: 6edb32282d7a57bf80ec206a749fd179e8f99e623ee3c9dcacf697d1e48fe1b6
150 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The PDF file contains embedded JavaScript, flagged by multiple heuristics as malicious and indicative of an exploit. The JavaScript stream, specifically stream_003_off000005b7.js, likely contains obfuscated code designed to exploit a PDF vulnerability and execute a secondary payload. The presence of PDF_JS_EXPLOIT_CLUSTER and ML_NYX_PDF_MALICIOUS firings strongly suggests this malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

Heuristics 6

  • PDF JavaScript exploit cluster critical PDF_JS_EXPLOIT_CLUSTER
    PDF combines an executable JavaScript/action surface with exploit staging indicators such as eval/unescape/fromCharCode, XFA script content, or a related CVE pattern. Benign form JavaScript remains low-severity, but this correlated cluster is high-confidence malicious behavior.
  • 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_off00000325.bin
2e3052aaf1b098157902ab86b08219f8f1bcee19bf4c1be9e755ad0feb4c5662		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x325 653 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 3 eval/decoder/string-building token(s).
stream_003_off000005b7.js
600cc86cb59f84e388f5aa3d6403cadebf03a2d36eaf4ff605ec91a1a5b91018		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5B7 407 bytes

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