Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8bc9a1f18475e1a…

MALICIOUS

PDF

33.1 KB
MD5: c49fe6447f146f20281ac00296b4ab8f SHA-1: ca70b1f50d1bb145b118804350848e0fa234b1f5 SHA-256: e8bc9a1f18475e1a7d75e3beb029b38efbae5658596439aa10067e1121790588
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File

The PDF contains embedded JavaScript and a RichMedia (Flash) object, which ClamAV identified as 'Heuristics.PDF.ObfuscatedNameObject'. An extracted SWF file was also detected by ClamAV as 'Swf.Exploit.Kit-513'. This indicates the PDF is designed to deliver an exploit, likely targeting vulnerabilities within the Flash player.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9945

Heuristics 7

  • ClamAV: Heuristics.PDF.ObfuscatedNameObject critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Heuristics.PDF.ObfuscatedNameObject
  • 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
csvnCDghttKH.swf
82959a74bd2f365dbaff0af8a126e8d6efed63f658723f179f7020ea3628ed8b		 pdf-embedded-file PDF EmbeddedFile object 16 at offset 0x15B6 27931 bytes
Detection
ClamAV: Swf.Exploit.Kit-513
Obfuscation or payload: likely
Carved artifact entropy is 7.99, consistent with packed or encrypted content.
javascript_obj0006_000.js
2e6a8fbd0209f2a3ee521139e0dfd09650ff349239af30356f3dd3834488d6c8		 pdf-javascript-stream PDF /JS object 6 at offset 0x142 3814 bytes

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