Malicious PDF / .PDF_ — malware analysis report

Static analysis result for SHA-256 5b21100b828b7775…

MALICIOUS

PDF / .PDF_

788.0 KB
MD5: 3668b018b4bb080d1875aee346e3650a SHA-1: fc53525f4e2e5b8ebe86778c20fd8916612cfd29 SHA-256: 5b21100b828b77758bfd6495c924e71f8bbd890c78d07067928bd7beccae087e
216 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF sample was flagged as malicious by multiple heuristics, including critical detections for JavaScript exploits and ML classification. The presence of JavaScript actions and embedded JS streams, combined with encryption that hides the payload, strongly suggests it's designed to download and execute a second-stage exploit or malware. The ClamAV detection name 'Pdf.Dropper.Agent-7263545-0' further supports its role as a dropper.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 7

  • PDF JavaScript exploit cluster critical PDF_JS_EXPLOIT_CLUSTER
    PDF combines an executable JavaScript/action surface with exploit staging indicators such as eval/unescape/fromCharCode, XFA script content, or a related CVE pattern. Benign form JavaScript remains low-severity, but this correlated cluster is high-confidence malicious behavior.
  • ClamAV: Pdf.Dropper.Agent-7263545-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Dropper.Agent-7263545-0
  • Encrypted PDF carries /OpenAction — payload hidden from static analysis high PDF_ENCRYPTED_WITH_JS
    PDF declares /Encrypt and also references an executable trigger (/OpenAction). Document encryption hides the JavaScript body and stream contents from static scanners — combined with auto-execution indicators this is a known evasion pattern used to deliver weaponised JavaScript that the analyst cannot inspect without the decryption key.
  • 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
  • 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://ns.adobe.com/xdp/
    • http://www.xfa.org/schema/xci/3.0/
    • http://www.xfa.org/schema/xfa-template/2.8/
    • http://www.xfa.org/schema/xfa-data/1.0/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_000_off0006d7f3.js
dcefc16710d335e69f60cdd8a0e174d43939d02eaa8dd4c6d7ce4ca63f06495b		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x6D7F3 289498 bytes

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