Malicious PDF — malware analysis report

Static analysis result for SHA-256 63240cd8a1b9bd99…

MALICIOUS

PDF

27.7 KB
MD5: 8dde7072eeb2a9dad55c796853fdf0c4 SHA-1: a58f20cd326a363a514789527bf9cc4370829db1 SHA-256: 63240cd8a1b9bd99c3b8f5d8080bd96b1df1cee2e30928a05d2e7409ba6fc231
166 Risk Score

Malware Insights

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

The PDF document contains embedded JavaScript, indicated by multiple heuristic firings and the presence of JS streams. The ClamAV detection of 'Win.Trojan.Agent-36100' strongly suggests malicious intent. The JavaScript appears to be obfuscated but is designed to execute arbitrary code, likely downloading a further stage. The primary IOC is the file's SHA256 hash.

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
7ee047242f2d4323fa057b15144d5e241f7e5c4cb39f981c6dc3c0382eb558c7		 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
b66879026d066e305afa5622565107f57919ab12e5e2d25dff0ced30079a407f		 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
b6098accd62d5e6e5a4037e1068cf0ba4ee25e37410910c714252f208ac3c734		 deobfuscated-js double percent-decoded annotation JavaScript at offset 0x1E7 15189 bytes

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