Malicious PDF — malware analysis report

Static analysis result for SHA-256 e11bf86874b918d1…

MALICIOUS

PDF

6.9 KB
MD5: e7732e98b8fa9cdfe53ecc36bc421f8d SHA-1: db50a9cbf85a8c334ca5c09381a982f34ef49136 SHA-256: e11bf86874b918d1b14b68512b19cab32940b15d552258cb1e5a62ee0277c204
88 Risk Score

Malware Insights

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

The PDF sample contains embedded JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT and PDF_JS. The ML classifier strongly flagged this PDF as malicious. The JavaScript stream, specifically noted as having an unescape() call, is likely responsible for exploiting a vulnerability within the PDF reader to execute arbitrary code. No specific URLs or further payloads were extracted, limiting the ability to determine the exact second-stage action.

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
0ebf6a67e27002ef2c85dfda95b836bd81df90d4bae7a077aa88d57de6042bec		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x327 2032 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
8409b1d9793e06012ebde615aaa39f606c538389a4097a78398cc0cc1c59464f		 pdf-objstm-decoded PDF /ObjStm 24 0 obj (inflated) 331 bytes

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