Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab1c939b51ba498c…

MALICIOUS

PDF

4.4 KB
MD5: e22691f6932847b9737490e38d494dcc SHA-1: 34b6f49beffcdde43238b885312f06c6cba85011 SHA-256: ab1c939b51ba498c9f8af042ed809aa95766e771dc6f5918c5a8a346cbd10a71
196 Risk Score

Malware Insights

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

The PDF file contains embedded JavaScript and triggers a U3D/3D content vulnerability, indicating it's designed to exploit Adobe Reader. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded JavaScript is likely responsible for downloading and executing a second-stage payload, as indicated by the 'Pdf.Dropper.Agent-1506717' ClamAV signature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 8

  • U3D/3D content in PDF — Adobe Reader 3D parser CVE-family indicator high CVE related PDF_U3D_CVE_RELATED
    PDF contains U3D (Universal 3D) or 3D annotation content — CVE-2011-2462 and CVE-2009-3953 are critical vulnerabilities in Adobe Reader's U3D processing that allow arbitrary code execution. U3D content in PDFs is extremely rare in normal documents.
  • ClamAV: Pdf.Dropper.Agent-1506717 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Dropper.Agent-1506717
  • 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.
  • 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.
  • XFA form low PDF_XFA
    PDF uses XML Forms Architecture — can contain script logic
  • 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.microsoft.org/schema/xci/2.6/
    • http://www.microsoft.org/schema/xffdsa-template/2f/
    • http://ns.adobe.com/xdp/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0016_000.js
06f8e13b1e90227e4378ccd2fafe98245828101e215cad62dfe790e54fc1d7bd		 pdf-javascript-stream PDF /JS object 16 at offset 0x93F 4336 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 2 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).
u3d_00_off000004ae.bin
db47f9e6c2fa22cca9aaaaba842bc1035f54c0acd3737dbd64b69dc1671da5eb		 pdf-3d-stream PDF U3D 3D stream at offset 0x4AE 1268 bytes

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