Malicious PDF — malware analysis report

Static analysis result for SHA-256 c317ce2efd83e994…

MALICIOUS

PDF

31.3 KB
MD5: 25358ea6fb803f82f199206d2fbe8dcc SHA-1: 24215c71944c95db1aa1f38e6a20364b6f80a76f SHA-256: c317ce2efd83e994c639c698c584d95138eca0841a6c0b2db4981f7e759d9f42
186 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 JavaScript T1204.002 Malicious JavaScript

The PDF file contains embedded JavaScript and a RichMedia (Flash) object, indicating an attempt to exploit vulnerabilities. ClamAV detection of 'Pdf.Exploit.Agent-35955' further confirms malicious intent. The embedded JavaScript stream, named 'javascript_obj0006_000.js', is likely responsible for downloading and executing a secondary payload, as suggested by the 'PDF_JAVASCRIPT' and 'PDF_JS' heuristic firings. The presence of an embedded binary file ('embedded_file_obj0016.bin') also points to a multi-stage attack.

Heuristics 7

  • ClamAV: Pdf.Exploit.Agent-35955 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Exploit.Agent-35955
  • ClamAV detection on extracted artifact critical EXTRACTED_FILE_CLAMAV
    ClamAV flagged at least one file extracted from inside this sample. Even when the wrapping document carries no AV detection of its own, a hit on the carved artifact is a strong indicator the sample is a delivery vehicle.
  • 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
  • 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.

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
embedded_file_obj0016.bin
c2b666a3ef4c191b77b78c037656e50477b8ba3d35fd61ae843a3a1f4d41c5c1		 pdf-embedded-file PDF EmbeddedFile object 16 at offset 0x1312 26774 bytes
Detection
ClamAV: Pdf.Exploit.Agent-35955
Obfuscation or payload: likely
Carved artifact entropy is 7.99, consistent with packed or encrypted content.
javascript_obj0006_000.js
b02392571e582aec3202bb0639294c7d42936191494e8a119150094b82c5f4de		 pdf-javascript-stream PDF /JS object 6 at offset 0x148 3153 bytes

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