Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad1474b02b06428b…

MALICIOUS

PDF

226.2 KB
MD5: c436530c8d9bf3f580a64d2b731ecf21 SHA-1: b89d8960ed0d41565ed8926e511366a75d422333 SHA-256: ad1474b02b06428b78da42d68d240b49a4bb80872aae0e2c2a09056aef56cf37
206 Risk Score

Malware Insights

MITRE ATT&CK
T1555 Credentials from Password Stores T1204 Malicious Link T1059 Command and Scripting Interpreter

The PDF document contains embedded JavaScript and a critical heuristic firing indicates an embedded Windows executable payload. ClamAV identified the embedded artifact as Win.Trojan.Perflog-51. The extracted file name is inst_readme.exe. The embedded JavaScript and executable payload suggest the document is a delivery mechanism for malware.

Heuristics 7

  • Embedded Windows executable payload in PDF stream critical PDF_EMBEDDED_PE_PAYLOAD
    PDF stream bytes contain an embedded Windows executable with a verified PE header. Exploit chains often hide droppers inside ordinary streams rather than standard /EmbeddedFile attachments.
  • ClamAV: Win.Trojan.Perflog-51 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Win.Trojan.Perflog-51
  • 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.
  • Embedded file low PDF_EMBEDDED
    PDF embeds a file attachment — could carry an executable or another weaponised document as a nested payload
  • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
inst_readme.exe
397cb5cc746e664aaf7e033b09d558d633490b27716ec7924936c89e5f77250e		 pdf-embedded-file PDF EmbeddedFile object 8 at offset 0x3BB 251136 bytes
Detection
ClamAV: Win.Trojan.Perflog-51
Obfuscation or payload: likely
Carved artifact entropy is 7.84, consistent with packed or encrypted content.
javascript_obj0009_000.js
0d2a2e5522d30fc66b9f21fc965d2a7bbdcbbf3cf8a4303496b70c23d8d21c8c		 pdf-javascript-stream PDF /JS object 9 at offset 0x38727 64 bytes
javascript_obj0009_001.js
7851a6e4189a7ff8e3490d1e3d6beb54ee9937337dd2d3ee953d3e8b61ee65f4		 pdf-javascript-stream PDF /JS object 9 at offset 0x38727 62 bytes

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