Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b6557d30de6965b…

MALICIOUS

PDF

300.7 KB
MD5: cb77f60d41df79a44b75b2a7e5d7d6c5 SHA-1: 3c694e85444bbc9e06f2769efc6abf0571bb5b11 SHA-256: 1b6557d30de6965bd5e6291128b9909253bd41ee058768101e26f2c0df4323e9
146 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1553.005 Mark-of-the-Web Bypass T1105 Ingress Tool Transfer

This PDF file exhibits multiple critical heuristic firings, including the presence of embedded JavaScript and a Windows executable payload. The embedded JavaScript, identified as 'javascript_obj0012_000.js', is likely responsible for executing the embedded Portable Executable (PE) file, 'embedded_pdf_0002cd45.exe'. This indicates a multi-stage attack where the PDF acts as a dropper for a secondary malicious payload.

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: Heuristics.PDF.ObfuscatedNameObject critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Heuristics.PDF.ObfuscatedNameObject
  • 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.
  • XFA form low PDF_XFA
    PDF uses XML Forms Architecture — can contain script logic
  • 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.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://ns.adobe.com/xdp/
    • http://www.xfa.org/schema/xci/2.6/
    • http://www.xfa.org/schema/xfa-template/2.6/

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0012_000.js
fef83c0c8a0e8b3c7d4abfc5840d9c346f3bc64c45152bf0123e3bc67ac7c2e4		 pdf-javascript-stream PDF /JS object 12 at offset 0x4A24D 5209 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 eval/decoder/string-building token(s).
stream_000_off00000337.bin
3d68b6c65f2aff682ee36830025e4b0bbc1d6190719567586d71e5b17223b3fc		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x337 525856 bytes
embedded_pdf_0002cd45.exe
134290aa3b149f9e74c1f654ec13eb88ed554418fb8a3698b7f05058966f4d61		 embedded-pe PDF decompressed stream PE payload at offset 0x2CD45 343058 bytes

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