Malicious PDF — malware analysis report

Static analysis result for SHA-256 39f26fb4feac5d02…

MALICIOUS

PDF

147.2 KB
MD5: ee2870344a5727f9f529951f1c6ed063 SHA-1: b2a7126d4745bfcbedc5196b9403ffd25a302127 SHA-256: 39f26fb4feac5d0256291a6ae93c4c4848d1b4987c665ac9a6a27c956d53c1d6
176 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics, including PDF JavaScript actions and ML classification. The presence of embedded JavaScript streams, specifically javascript_obj0013_000.js and javascript_obj0013_001.js, indicates an attempt to execute code. The unescape() call and ASCIIHexDecode filter further suggest obfuscation and exploit delivery. ClamAV detection as 'Pdf.Exploit.Agent-36189' confirms its malicious nature. The embedded URL http://www.bitstream.com is a potential indicator for the second-stage payload download.

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
f0dd8ec2ef4018539c0fb966e4de0ff86c1b8be4c3a249fa6d5c92397ed6e95d		 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).
javascript_obj0013_001.js
98fd17c126c96a6eaf213e455fd8d8e903159752aff52957511a2647ff5c4898		 pdf-javascript-stream PDF /JS object 13 at offset 0x1056D 27645 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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