Malicious PDF — malware analysis report

Static analysis result for SHA-256 7dafa9e652153574…

MALICIOUS

PDF

33.1 KB
MD5: 98e486e7f27c3ce57180637f539a0fdb SHA-1: 87006614e3702e781ef3d45687a71eef87a91008 SHA-256: 7dafa9e652153574474dd4cfb006a8d2855fa3131631591b3c3af8fe612e12fa
216 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including critical detections for JavaScript actions, embedded files, and RichMedia (Flash). ClamAV detected the file as 'Heuristics.PDF.ObfuscatedNameObject' and an extracted artifact as 'Swf.Exploit.Kit-513'. The presence of embedded JavaScript and a SWF file strongly suggests an attempt to exploit vulnerabilities or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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
NmKjKtHFGOyu.swf
82959a74bd2f365dbaff0af8a126e8d6efed63f658723f179f7020ea3628ed8b		 pdf-embedded-file PDF EmbeddedFile object 16 at offset 0x15DF 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
3c74c1acc691ef06302c69eddd395572808123b2e56e219b0fea5a20a5f06b80		 pdf-javascript-stream PDF /JS object 6 at offset 0x144 3901 bytes

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