Malicious PDF — malware analysis report

Static analysis result for SHA-256 77ae0d36dd09afb1…

MALICIOUS

PDF

45.0 KB
MD5: 3489875ad12c981d7088dadecbdf6baa SHA-1: f141c5562bc65309ba3b3ed00afeb22ed969d4f1 SHA-256: 77ae0d36dd09afb1e09eede8f14d93c8d1a3a082251fc773d894018dcf680394
166 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating it contains an exploit. Embedded JavaScript streams were extracted, which are heavily obfuscated but likely intended to download and execute a second-stage payload. The presence of PDF-specific exploit heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 4

  • ClamAV: Pdf.Exploit.Agent-36128 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Exploit.Agent-36128
  • 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
a6cac47570ffecccb241348d29f504a47eaff36b683c93adadf407f0a8be05b3		 pdf-javascript-stream PDF /JS object 8 at offset 0x1E7 45305 bytes
javascript_obj0008_001.js
116d23f6f81a821d1e762c16bb6efc679d39ecc46ea1f2a7a7cbf58d40ff2c53		 pdf-javascript-stream PDF /JS object 8 at offset 0x20A 45555 bytes
Detection
ClamAV: Pdf.Exploit.Agent-36128
Obfuscation or payload: unlikely
legacy_pdfkit_stage_000.js
b3e4cf2d9d8088548fbcefef3addfd85f61b899ce1aefc0c77aafb74f3c0741e		 deobfuscated-js double percent-decoded annotation JavaScript at offset 0x1E7 33047 bytes

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