Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ff74458dc840600…

MALICIOUS

PDF

1.17 MB Created: 2009-12-17 03:14:38 +08:00 Authoring application: PScript5.dll Version 5.2 (via Acrobat Distiller 7.0.5 (Windows))
MD5: f42f5216ba9a06776f44f1743572c3e8 SHA-1: c4fde3f5f93ddf3a2f80c4d0589af60cbe015a34 SHA-256: 6ff74458dc8406002ed0d2db5008efc222a3c3d6611e9922bcc63cae764a6a6f
60 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, indicated by multiple heuristic firings and the presence of a JavaScript stream. The script appears to be designed to exploit a vulnerability and execute arbitrary code, likely downloading a secondary payload. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is a malicious document delivered as an attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • 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
  • 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.
  • 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.w3.org/1999/02/22-rdf-syntax-ns#
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/xap/1.0/mm/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
k1
d5005e6ee2e649716afeda73fc5624d60ddac2ec2e3497a03f11116991a6a4e7		 pdf-embedded-file PDF EmbeddedFile object 26 at offset 0x1EC1 1206312 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact entropy is 8.00, consistent with packed or encrypted content.
javascript_obj0031_000.js
d2c22f390ebe1d3b601de398c614f4cd8b39648bca6d3aaaa51f825d60e3e242		 pdf-javascript-stream PDF /JS object 31 at offset 0x12B202 918 bytes

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