Malicious PDF — malware analysis report

Static analysis result for SHA-256 18c405d3dc147243…

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: d7652f51a3195619102ae4725859408e SHA-1: f0c5925381db5aaacfa3b00ba61d1bd193582d8c SHA-256: 18c405d3dc147243bd704bd1434a6c129803b3fb16bde411bf60d8de768efdb4
120 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, identified by multiple heuristics and flagged by ML classifiers as malicious. The embedded JavaScript, when executed, is designed to download and run a secondary payload, as indicated by the 'Pdf.Exploit.Agent-21747' ClamAV detection and the presence of a large embedded artifact. The primary attack vector is likely spearphishing, with the PDF serving as the attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 7

  • ClamAV: Pdf.Exploit.Agent-21747 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Exploit.Agent-21747
  • 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
849de809d4de4072c996952cf5acc135c505c3ec1b65624e8aa929fb8a7a67f9		 pdf-javascript-stream PDF /JS object 31 at offset 0x12B202 5537 bytes

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