Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb875f1011a637e4…

MALICIOUS

PDF

2.7 KB Created: 5790-01-01 Authoring application: 6298
MD5: 9fb2dfabcf807ebc01930fea8e8c77b1 SHA-1: 803640d84de55e30f500b54bbbc1bdf7cfb45ce5 SHA-256: fb875f1011a637e47a86a9fbd6d30624ad79c584e2c9d2bf4a1b6db32a43f408
96 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 Scripting: JavaScript

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings including 'PDF_JAVASCRIPT' and 'PDF_JS'. The embedded JavaScript file 'javascript_obj0013_001.js' is flagged for suspicious characteristics such as hex escape obfuscation and script obfuscation. ClamAV also detected this as 'Pdf.Exploit.Agent-36014', suggesting it exploits a known PDF vulnerability. The primary function appears to be the execution of this malicious JavaScript.

Heuristics 4

  • ClamAV: Pdf.Exploit.Agent-36014 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Exploit.Agent-36014
  • Suspicious extracted artifact medium 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.
  • 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.

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0013_001.js
720f833ce610696d88bec8f833bc66e86694eb3b3ccbea31c795dd161010b8d2		 pdf-javascript-stream PDF /JS object 13 at offset 0x328 4778 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 10 eval/decoder/string-building token(s). Carved artifact contains 3 long hex-escaped blob(s).

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