Malicious PDF — malware analysis report

Static analysis result for SHA-256 052e37e3d71ca8d2…

MALICIOUS

PDF

2.7 KB
MD5: 213c35573bfa5c22d6617447234a8371 SHA-1: f638e18744428c71a2150264e9917dd77dead71e SHA-256: 052e37e3d71ca8d2bb1b2044ae8be093caee74e983e93567e6860959cd7b1e0c
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript which is flagged as an exploit cluster, likely targeting a vulnerability. The script reconstructs a URL, 'https://sirs.biz/p/download.php?p=65-302-992', which is likely used to download and execute a second-stage payload. The presence of XFA forms and RichMedia (Flash) further indicates a complex exploit chain.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 7

  • 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.
  • 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
  • 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://ns.adobe.com/xdp/
    • http://www.xfa.org/schema/xci/2.6/
    • http://www.xfa.org/schema/xfa-template/2.6/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0006_000.js
4e9fbd9dee0037b1f206f772e0f5c56d500912f1a9d4cbceefd54bff251c41da		 pdf-javascript-stream PDF /JS object 6 at offset 0x106 1561 bytes

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