Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc10eeffc1400e20…

MALICIOUS

PDF

6.5 KB
MD5: f5b6c615c59c8f57a4141aff9ba63919 SHA-1: 3da981311a7151a6647dc3d5cff48c98f667fcb7 SHA-256: fc10eeffc1400e20954109747fb5a04178b90d4cad36065a0c877dd68e2cc37e
88 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell

The PDF contains embedded JavaScript, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. The unescape() function call within the JavaScript stream suggests obfuscation, a common technique for malicious scripts. The ML classifier also flagged this PDF as malicious with a high score. While no specific URLs were identified as malicious, the presence of obfuscated JavaScript points to an attempt to download and execute a secondary 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_off00000325.bin
db775cfbf3490ea0095f3113599d942064f6576bedf3b9f02fee506720239cf7		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x325 683 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 eval/decoder/string-building token(s).
stream_003_off000005c5.bin
9fed87a5649451d60ba408547bfac117b808d1e88b2c872f409f654753ff528f		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5C5 438 bytes

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