Malicious PDF — malware analysis report

Static analysis result for SHA-256 10d238ea6d533c00…

MALICIOUS

PDF

44.6 KB
MD5: e1f16f61c4b0ea906d5574f73907d145 SHA-1: e506a0a566604e1cdb543b165c8d656c53e52a53 SHA-256: 10d238ea6d533c00e10d200afd86384e7beb8c7c41e7ce0c2710656121bc5fba
118 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 is obfuscated but appears to be designed to download and execute a second-stage payload. The ML classifier and PDF JavaScript exploit cluster heuristics strongly indicate malicious intent. The script's functionality, combined with the PDF format and exploit cluster, suggests a common attack pattern for delivering malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 6

  • 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.
  • 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
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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.bitstream.com
    • http://ns.adobe.com/xdp/
    • http://www.xfa.org/schema/xci/2.6/
    • http://www.xfa.org/schema/xfa-template/2.6/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0007_000.js
e8271ab5fdc9c9c1d8bbef96ac9026326c33227609a6ddd0d22e8e08ec785d18		 pdf-javascript-stream PDF /JS object 7 at offset 0x873 987 bytes
font_00_sfnt_off000010e3.bin
044efaa0fcddad6a1afc97a6bd112675dff8d542f6a622fb73e7eb17d43d90f7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10E3 65932 bytes

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