Malicious PDF — malware analysis report

Static analysis result for SHA-256 13953acf6bbcb8ef…

MALICIOUS

PDF

6.8 KB
MD5: 180e47db90e41e85bd965c12ece95820 SHA-1: 3fb6177334503abf98c14f6f14b817558e9516ff SHA-256: 13953acf6bbcb8ef1cb6cb51126c5afd1309747e8b81059ec8ba04537083b53c
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 that is obfuscated and likely exploits a vulnerability within PDF viewers. The 'PDF_JS_EXPLOIT_CLUSTER' and 'PDF_UNESCAPE' heuristics indicate a high likelihood of client-side exploitation. The embedded JavaScript stream, 'stream_003_off00000717.js', is the primary artifact responsible for executing the malicious payload, likely leading to further compromise.

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_off00000327.bin
8297a16d93dcfc672beb9232d545cf625ed91a1c4aabc9a705750e498af91796		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x327 1487 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 3 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).
stream_003_off00000717.js
2fc7efadca2ab9c885c6f2b43ceec714df3b4795f475fab020323c98f77c85f6		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x717 405 bytes

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