Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3e72400f2dd7094…

MALICIOUS

PDF

6.6 KB
MD5: d824a79c10559a2583e1dd968ee838d4 SHA-1: 1e43216f2ab62a1ac7055f533fe883a7ca89e8b1 SHA-256: c3e72400f2dd709499444c98bb13be8508ddc58c49764be3f48c31c6979c265c
88 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell

The PDF contains embedded JavaScript, indicated by PDF_JAVASCRIPT and PDF_JS heuristics. The ML classifier strongly flags this PDF as malicious. The presence of an unescape() call suggests obfuscated JavaScript intended to download and execute a second-stage payload. No specific family could be identified, but the technique is common for initial access.

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_off00000327.bin
1f95534f1b30112f75b89b2ed2d9d1ab0a4072b8267d2b85304460edd3f89e04		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x327 1357 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).
objstm_0024_00.bin
473c36d35906fe18bf505c231d5de45aab3ebcef3d37955771843c6a4896ec27		 pdf-objstm-decoded PDF /ObjStm 24 0 obj (inflated) 331 bytes

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