Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d1c27baa90ccf80…

MALICIOUS

PDF

1.00 MB Created: 2013-05-04 12:12:18 +02:00 Authoring application: Acrobat PDFMaker 9.0 pour Word (via Acrobat Distiller 9.0.0 (Windows))
MD5: bec425cadaa958f3e48e81c451e4fd37 SHA-1: 24ac57201cc970f902317e06555d057a0d0316d9 SHA-256: 6d1c27baa90ccf808fe69e7c3b5223cef946fcdc5298b812f14c7201b86c7048
136 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF contains JavaScript that attempts to exploit a vulnerability, likely targeting older Adobe Reader versions (detected by PDF_JS_EXPLOIT_CLUSTER and PDF_EVAL heuristics). The script constructs a URL using the domain 'www.dtri.org' and a unique identifier, and attempts to download a second-stage payload. The specific URL constructed is 'http://www.dtri.org/nocache/285c73b4b1419d0dc6b8b1d7eaa01c7e

Machine Learning

  • Nyx PDF Classifier suspicious score 0.2820

Heuristics 8

  • 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.
  • eval() call high PDF_EVAL
    eval() found — commonly used for obfuscated exploit execution (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.
  • Additional-actions dictionary low PDF_AA
    PDF defines /AA (Additional Actions) that references an executable action (JS/JavaScript/Launch/SubmitForm) — can auto-trigger on document or widget events. Form-field calc/format/validate/keystroke handlers in legitimate interactive forms commonly fire this, so it is reported as a low-weight signal; weaponised auto-execution is flagged by stronger rules (PDF_OPENACTION, encrypted-with-JS, etc.)
  • Optional Content Group with action trigger low PDF_OPTIONAL_CONTENT
    Optional Content Group (layer) co-occurs with an action trigger — content can be selectively hidden from viewers or scanners while the action still fires on open
  • 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.denniswerner.com.br/dennis.htm
    • http://www
    • http://www.yale.edu/hraf/
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/pdf/1.3/
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/pdfx/1.3/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0001_004.js
c6adfcb7e6cdf7c337a930b2ab83b989c096a0f24a8189c13dba988903dcabe1		 pdf-javascript-stream PDF /JS object 1 at offset 0xF 1558 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 8 eval/decoder/string-building token(s).
font_00_sfnt_off000dc2c2.bin
f2fdc81a8834798c310cdc95a4902a696f7b4e8e21f0b3e8482f619b1b51542d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDC2C2 55336 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.