Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0efec7665ffcb7f…

MALICIOUS

PDF

147.5 KB
MD5: f9abdaf29d12cb584a4ca74e2f102a3b SHA-1: 5e7926e2a4326b9fc21aa24d01a74c1ceab2e178 SHA-256: c0efec7665ffcb7fd463cd6468433660cf61c595f53dcc281a70db913b9e950f
176 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1204.002 Malicious File

The PDF sample contains embedded JavaScript and triggers multiple PDF-specific heuristics, including unescape calls and ASCIIHexDecode filters, indicating an exploit attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded JavaScript streams are likely responsible for downloading and executing a second-stage payload from one of the unknown-reputation URLs found within the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 8

  • ClamAV: Pdf.Exploit.Agent-36189 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Exploit.Agent-36189
  • unescape() call high PDF_UNESCAPE
    unescape() found — often used to decode shellcode in PDF JS exploits (matched inside decoded stream)
  • ASCIIHexDecode filter (with exploit indicators) medium PDF_FILTER_HEX
    Hex-encoding filter present alongside exploit delivery indicators — often used to hide payload or shellcode bytes
  • 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://www.bitstream.com
    • 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_obj0013_000.js
8692acb6a47bde8793e5791f13707c8aca85d43850708598ed292e7651dbafcb		 pdf-javascript-stream PDF /JS object 13 at offset 0x10531 27749 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 2 eval/decoder/string-building token(s).
javascript_obj0013_001.js
19c0e9929a9f05f8edd0c78f52b93e19bdf3bcb77d21a0e5ddb81c3ac357d786		 pdf-javascript-stream PDF /JS object 13 at offset 0x1056D 27757 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 2 eval/decoder/string-building token(s).
font_00_sfnt_off00000352.bin
a8f4d9b7d604c3c8a0bf3f9a31b9e952d467f98d118fdc784d95d689a14d8a33		 pdf-font-stream PDF embedded font (sfnt) at offset 0x352 65932 bytes

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