Malicious PDF — malware analysis report

Static analysis result for SHA-256 0411d420af0ae4d6…

MALICIOUS

PDF

27.7 KB
MD5: 538ef272f34cd5892d010e3f5e42309e SHA-1: 9bbef5a192810e762f23354184e0c6188cae89d2 SHA-256: 0411d420af0ae4d673d690aa31adc3fac3dcfe38a90a805881aeb4d5075fa8b6
166 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF file contains embedded JavaScript, flagged by multiple heuristics, including ML and ClamAV detection as Win.Trojan.Agent-36100. The JavaScript appears to be heavily obfuscated but is designed to download and execute a secondary payload. The presence of JavaScript and the malware detection strongly suggest a malicious document delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 4

  • ClamAV: Win.Trojan.Agent-36100 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Win.Trojan.Agent-36100
  • 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.
  • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0008_000.js
1d1cb5a28706c9302229e63b9990f32c3e6da2f1676c7468b15d03fe8968700d		 pdf-javascript-stream PDF /JS object 8 at offset 0x1E7 27621 bytes
Detection
ClamAV: Win.Trojan.Agent-36100
Obfuscation or payload: unlikely
javascript_obj0008_001.js
a608e8761b7a984f9fd9faa421c1b935ffb6e3f833de220c7fcab2745e001099		 pdf-javascript-stream PDF /JS object 8 at offset 0x20A 27871 bytes
Detection
ClamAV: Win.Trojan.Agent-36100
Obfuscation or payload: unlikely
legacy_pdfkit_stage_000.js
95dc0a8216ad56c976823260e0b77641100bd29f3b3ef438cd69a6178db536e3		 deobfuscated-js double percent-decoded annotation JavaScript at offset 0x1E7 15189 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.