Malicious PDF — malware analysis report

Static analysis result for SHA-256 af8f7244d6563134…

MALICIOUS

PDF

147.5 KB
MD5: c6d4da45355688af7c1b0de8e9a96a4a SHA-1: 85ea33553da5e595cf8034614f11cb34a6c93083 SHA-256: af8f7244d6563134ebbc7848af28a49064d2c0fe2e808b8b7eb4fc03ffb928ed
176 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV (Pdf.Exploit.Agent-36189) and a machine learning classifier. It contains embedded JavaScript, which is further indicated by heuristic firings for PDF_JAVASCRIPT, PDF_JS, and PDF_UNESCAPE. The JavaScript is likely responsible for downloading and executing a second-stage payload from one of the embedded URLs, such as http://www.bitstream.com. The presence of XFA form elements and ASCIIHexDecode filters also suggests exploit activity.

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
7af6a83d20234a0cee35debeae9642e55c96d25e274de211e301f789d61d5df1		 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
f2a37976ecfea0c0ba3450f06aeab73449eda27c5de1715ccefc20d801348c06		 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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