Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1ddf7f1d18b4cfc…

MALICIOUS

PDF

6.2 KB
MD5: ea0f9b97a30e4939c5769cb4a985a961 SHA-1: 207eeaa0ec7eef2c39b093b74a095a9c999fb6f8 SHA-256: e1ddf7f1d18b4cfc6f25e79bd193f7e54329d2c7640daf806df6c65d2452d318
88 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1204.002 Malicious File

The PDF contains embedded JavaScript, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. The unescape() function call within the script suggests obfuscation, and the ML classifier strongly flagged the PDF as malicious. The exact behavior of the script is unclear due to obfuscation, but it is designed to execute malicious code. No external URLs were found to be malicious.

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_off00000323.bin
d21856d7807f18a19db3a878f4bf8a0f71621d1eaed54eb071114852d6e5f91a		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x323 311 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 3 eval/decoder/string-building token(s).
objstm_0024_00.bin
f7f68f9e9a3cecf65517e86c270f94b9ddf85f3ba2e40e9b2c8b15173ebb106f		 pdf-objstm-decoded PDF /ObjStm 24 0 obj (inflated) 331 bytes

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