Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1622469eae14a1f…

MALICIOUS

PDF

6.5 KB Authoring application: Ghamariqegi (via 9b6eePizoxuafocebi)
MD5: a1764dd516b2f46b6d6c3b0ad8a8ea10 SHA-1: 32fad8481486975dfb35c25983db2d7ac9492d65 SHA-256: b1622469eae14a1ff97f97bc7a54c28e9baf9d36764a9d050c591e6a767dace0
108 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1566.002 Spearphishing Attachment

The PDF was flagged as malicious by multiple heuristics, including a critical ClamAV detection for obfuscated objects and an ML classifier with a high confidence score. Embedded JavaScript was detected, indicating an attempt to execute malicious code. The presence of obfuscated JavaScript suggests the script is designed to download and execute a second-stage payload, a common technique for malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 4

  • ClamAV: Heuristics.PDF.ObfuscatedNameObject critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Heuristics.PDF.ObfuscatedNameObject
  • 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.
  • 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 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0010_000.js
2c5522e807b63b772d04981ce7060edb9be4bf1d8e75e0273768f249d0a5dae4
pdf-javascript-stream PDF /JS object 10 at offset 0x11BD 1914 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 eval/decoder/string-building token(s).