Malicious PDF — malware analysis report

Static analysis result for SHA-256 debb508cbb66ff17…

MALICIOUS

PDF

147.2 KB
MD5: afcba5ce69d40a11db1ce31c00f85300 SHA-1: 058a409de8a29821d92f1418bd2cb0efcb6b2c6f SHA-256: debb508cbb66ff1734954715e258a78b7bda36dfdf47b95da9b8dcbb2350f1e7
176 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 JavaScript/JScript T1566.002 Spearphishing Attachment

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 heuristics for unescape() calls and ASCIIHexDecode filters. The JavaScript is likely used to exploit a vulnerability within the PDF reader to download and execute a secondary payload, as suggested by the ML_NYX_PDF_MALICIOUS firing and the presence of obfuscated JavaScript. The URL http://www.bitstream.com is present but has an unknown reputation.

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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0013_000.js
6ce762062f9db02681ff6be28a1bbf87f8d7e1fbd4dcc95265f3c655709267da		 pdf-javascript-stream PDF /JS object 13 at offset 0x10531 27637 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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