Malicious PDF — malware analysis report

Static analysis result for SHA-256 a503147c0a2bd2a2…

MALICIOUS

PDF

31.4 KB
MD5: 83d824b74dfed06d1c91de8ac1a8a494 SHA-1: e138b8c5f8f8b97b9b33d5f801f7c6885ca5ec53 SHA-256: a503147c0a2bd2a2071a90ecbb003de88e6a8741593ec7e2538789d9785324d1
186 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 JavaScript/JScript T1559.002 Component Object Model T1204.002 Malicious File

The PDF file contains embedded JavaScript and a RichMedia (Flash) object, identified by ClamAV as Pdf.Exploit.Agent-35955. The JavaScript is likely responsible for triggering the exploit and loading the Flash content. The Flash object, named PefYmXuicljnATG.swf, is the primary embedded artifact and is suspected to be the malicious payload delivery mechanism. The presence of JavaScript and an embedded Flash file strongly suggests an exploit chain aimed at executing arbitrary code.

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
PefYmXuicljnATG.swf
c2b666a3ef4c191b77b78c037656e50477b8ba3d35fd61ae843a3a1f4d41c5c1		 pdf-embedded-file PDF EmbeddedFile object 16 at offset 0x1349 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
44538b2b649f5f52cf62b8906c0bab6f474f5b2d4035072a6a059e442dc30f7d		 pdf-javascript-stream PDF /JS object 6 at offset 0x14C 3284 bytes

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