Malicious PDF — malware analysis report

Static analysis result for SHA-256 e46b1e85dd161042…

MALICIOUS

PDF

8.1 KB Created: 2009-12-16 20:32:53 +08:00
MD5: 367bd545ac9e3d97a09b5d08954f5045 SHA-1: a26d7887ffd4e62d03e7d37954237b87c36c6e3d SHA-256: e46b1e85dd161042d6731e781c1a56b0eed4d25738e1f639c5cd4e436f25d9de
68 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell

The PDF file contains embedded JavaScript with a high-confidence eval() call, indicating that it is designed to execute arbitrary code. The presence of a decompressed JavaScript stream further supports this. The primary function of the script appears to be downloading and executing a second-stage payload, as suggested by the eval() usage and the embedded nature of the script. No specific malware family could be confidently identified.

Heuristics 7

  • eval() call high PDF_EVAL
    eval() found — commonly used for obfuscated exploit execution (matched inside decoded stream)
  • Embedded file low PDF_EMBEDDED
    PDF embeds a file attachment — could carry an executable or another weaponised document as a nested payload
  • 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)
  • PDF paints image(s) but contains no text operators info PDF_IMAGE_ONLY_LURE
    PDF has 1 image XObject(s) and the content stream contains no text-emitting operators (BT/ET, Tj, TJ, ', ") in either raw bytes or decompressed streams — this is the screenshot-as-PDF pattern used to bypass text-based scanners and to deliver instructions purely through rendered pixels. It is informational unless paired with invisible links or risky URI context.
  • 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://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/mm/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off0000031d.js
fea1ef0cf7cf41997252375f1307218e730ff9f282c95b11aae2469db47a4da7		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x31D 10491 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 eval/decoder/string-building token(s).
objstm_0021_00.bin
695d02880cca0e7681b511549b1055f43e105b218407918dc0707063b7975e04		 pdf-objstm-decoded PDF /ObjStm 21 0 obj (inflated) 330 bytes

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