Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bbe12572fa40f89…

MALICIOUS

PDF

145.0 KB
MD5: f266b6727658c686187631607a4de55a SHA-1: 15ee0a063c163b955b0348d43a4af3a5c8e4f19d SHA-256: 4bbe12572fa40f89a5c5a1f48d58460b64f50c513da518a80a820c5591c24f12
176 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1204.002 Malicious File 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, indicated by multiple heuristic firings including PDF_JAVASCRIPT, PDF_JS, and PDF_UNESCAPE. The JavaScript is likely used to exploit vulnerabilities within the PDF reader and download a second-stage payload from the embedded URL http://www.bitstream.com.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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
b61568091942febbc9af13fc6bb48d0d3f369a8ff241dcdb7ddf657906ba1ac6		 pdf-javascript-stream PDF /JS object 13 at offset 0x1085F 26581 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 2 eval/decoder/string-building token(s).
javascript_obj0013_001.js
c7f6b6c959bac71c6d6b5175aa584436a4490ba2309853d3c98da809974febba		 pdf-javascript-stream PDF /JS object 13 at offset 0x108A0 26589 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 2 eval/decoder/string-building token(s).
font_00_sfnt_off000003a3.bin
7813f961e3ea48ac03f584530a1b6df1c45846a2cbec9f0a91e622939d8ffc40		 pdf-font-stream PDF embedded font (sfnt) at offset 0x3A3 66655 bytes

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