Malicious PDF — malware analysis report

Static analysis result for SHA-256 57c7e0ce9ce2d660…

MALICIOUS

PDF

145.0 KB
MD5: a1535bba2cba896e5dfae40a393386cb SHA-1: ebc68dd45846a67a35ebbb2c25a01be4ca8913ed SHA-256: 57c7e0ce9ce2d660e3a8c10a80b391c16a0805f2a04c172fbce1049cd75d7b34
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 PDF_JAVASCRIPT and PDF_JS heuristics, which is further processed by PDF_UNESCAPE and PDF_FILTER_HEX, suggesting obfuscation and exploit activity. The ML classifier's high confidence score (0.999878) supports the malicious verdict. The embedded JavaScript, javascript_obj0013_000.js, likely downloads and executes a second-stage payload, which is a common technique for initial access and further compromise.

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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0013_000.js
aae7f54fdf3ac1680f47ade69733b25d5149e57ba64ff5b83a33d3a0fbf34205		 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).
font_00_sfnt_off000003a3.bin
7813f961e3ea48ac03f584530a1b6df1c45846a2cbec9f0a91e622939d8ffc40		 pdf-font-stream PDF embedded font (sfnt) at offset 0x3A3 66655 bytes

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