Malicious PDF — malware analysis report

Static analysis result for SHA-256 983456f31ad9197a…

MALICIOUS

PDF

25.8 KB Created: 2006-02-01 14:14:12 Authoring application: Wegoptyr (via HghTc6Fs)
MD5: 4988ba4c010d9bc0d5c43ec730cec0c6 SHA-1: ba9db883366003ea8e54b1ff3f23bd6ad9e0eeb7 SHA-256: 983456f31ad9197a640d3e89ee083227c66bfde6a05bd616ff75853d683b7238
118 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell

The PDF file contains embedded JavaScript streams, with one heuristic firing indicating the use of eval() for obfuscated code execution. The ClamAV detection name 'Pdf.Dropper.Agent-7285037-0' strongly suggests a dropper functionality. The embedded JavaScript likely downloads and executes a second-stage payload, although the specific details are obfuscated. The document body contains unusual strings that may be related to the obfuscation or payload.

Heuristics 5

  • ClamAV: Pdf.Dropper.Agent-7285037-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Dropper.Agent-7285037-0
  • eval() call high PDF_EVAL
    eval() found — commonly used for obfuscated exploit execution
  • 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0007_000.js
149e031a22af94c334c4c87c21b802f2114519dfcba79c1c7948c125f28b59af		 pdf-javascript-stream PDF /JS object 7 at offset 0x1EE 25328 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 2 eval/decoder/string-building token(s).
javascript_obj0007_001.js
9d150c0b5a8d39083838b8a7725f63a1506b2e6266f616772538a7404ffd07aa		 pdf-javascript-stream PDF /JS object 7 at offset 0x1EE 25058 bytes

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