Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ce9915a18fe5cb5…

MALICIOUS

PDF

7.1 KB
MD5: f78f098a2b99ed6ed7af14d622bb12bd SHA-1: ca09cfee46439152dc56747537e73687fee827b0 SHA-256: 7ce9915a18fe5cb5440cded29a4a29b31eac802b7e1c4ead0ab0c62b72735ad5
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 PDF_UNESCAPE heuristic suggests obfuscation within the script, which is further supported by the ML_NYX_PDF_MALICIOUS classifier firing with a high score. The embedded JavaScript streams are the primary indicators of malicious activity, likely serving to download and execute a second-stage payload. No specific family could be identified.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9825

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.bin
c5cd1fae9ef231f92bfbe31aab9102dd27758e1ba75b7406625fe4775f1eb9ee		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x327 2655 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_off0000083c.bin
9256dc2a305fffabb06c81153d2fe8cb8d88a133d485e6b31b9dca944d8fe75a		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x83C 442 bytes

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