Malicious PDF — malware analysis report

Static analysis result for SHA-256 110b09d89af85a13…

MALICIOUS

PDF

29.7 KB
MD5: df9b71ea09d979b6e29feace47885277 SHA-1: ad7453a1255587fb4f1eb9a9a9a7a406cb499736 SHA-256: 110b09d89af85a133f1441867de957e33bd0a11ea2b6e91c3bb4256b2763d44c
294 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The PDF file contains embedded JavaScript that utilizes String.fromCharCode to construct obfuscated code. This script is associated with PDF exploit clusters and is flagged as malicious by ML classifiers and ClamAV. The embedded JavaScript likely attempts to download and execute a second-stage payload from the unknown URLs provided, indicating a malicious document designed for exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 11

  • PDF JavaScript exploit cluster critical PDF_JS_EXPLOIT_CLUSTER
    PDF combines an executable JavaScript/action surface with exploit staging indicators such as eval/unescape/fromCharCode, XFA script content, or a related CVE pattern. Benign form JavaScript remains low-severity, but this correlated cluster is high-confidence malicious behavior.
  • ClamAV: Pdf.Exploit.Agent-35955 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Exploit.Agent-35955
  • ClamAV detection on extracted artifact critical EXTRACTED_FILE_CLAMAV
    ClamAV flagged at least one file extracted from inside this sample. Even when the wrapping document carries no AV detection of its own, a hit on the carved artifact is a strong indicator the sample is a delivery vehicle.
  • RichMedia (Flash) high PDF_RICHMEDIA
    PDF contains /RichMedia (Adobe Flash) which is a historic exploit vector
  • 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.
  • Embedded file low PDF_EMBEDDED
    PDF embeds a file attachment — could carry an executable or another weaponised document as a nested payload
  • XFA form low PDF_XFA
    PDF uses XML Forms Architecture — can contain script logic
  • String.fromCharCode low PDF_FROMCHARCODE
    String.fromCharCode found — used to construct payload strings dynamically. Common in benign JavaScript libraries for codepoint manipulation, so this alone is informational; weaponised use is also caught by the dedicated fromCharCode-stage and exploit-shape 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://code.flashdynamix.com/AES/aes-decrypt.php
    • http://code.flashdynamix.com/AES/aes-encrypt.php
    • http://ns.adobe.com/xdp/
    • http://www.xfa.org/schema/xci/2.6/
    • http://www.xfa.org/schema/xfa-template/2.6/
    • 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/xap/1.0/sType/ResourceRef#
    • http://adobe.com/AS3/2006/builtin

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
20101297.swf
155cb1ff00e6c687a380ad31d1ca035be4d34d8d46179a65e733a7fef7b99805		 pdf-embedded-file PDF EmbeddedFile object 16 at offset 0x8CB 53922 bytes
Detection
ClamAV: Pdf.Exploit.Agent-35955
Obfuscation or payload: unlikely
javascript_obj0006_000.js
f0e1cd9e741d18ecf5991c30016e5102358d2c754886735719ee1f3df15d43b3		 pdf-javascript-stream PDF /JS object 6 at offset 0x106 11732 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 239 eval/decoder/string-building token(s).

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