Malicious PDF — malware analysis report

Static analysis result for SHA-256 7016bb21b8b8ce58…

MALICIOUS

PDF

301.0 KB
MD5: 92fbc9fd707ccfd11e33050273dbf27b SHA-1: 0654952cfaf55a076460a67e05efcddb9694ab87 SHA-256: 7016bb21b8b8ce5855f41cc31288841e1fc9face93e9df5bfe6bbdb3ae19ddde
386 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution T1059.007 JavaScript

The sample is a malicious PDF that leverages JavaScript exploits, including eval() and String.fromCharCode, to execute arbitrary code. It contains an embedded Windows executable payload and an embedded JavaScript stream. The JavaScript likely downloads and executes the embedded payload from the URL http://board.eonlineworld.com/notice/dwsrmpa.exe, indicating a multi-stage attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 13

  • 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.
  • Embedded Windows executable payload in PDF stream critical PDF_EMBEDDED_PE_PAYLOAD
    PDF stream bytes contain an embedded Windows executable with a verified PE header. Exploit chains often hide droppers inside ordinary streams rather than standard /EmbeddedFile attachments.
  • ClamAV: Win.Trojan.Agent-321623 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Win.Trojan.Agent-321623
  • ClamAV detection on extracted artifact critical EXTRACTED_FILE_CLAMAV
    ClamAV flagged at least one file extracted from inside this sample. Even when the wrapping document carries no AV detection of its own, a hit on the carved artifact is a strong indicator the sample is a delivery vehicle.
  • eval() call high PDF_EVAL
    eval() found — commonly used for obfuscated exploit execution (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
  • Suspicious extracted artifact medium 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.
  • 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
  • String.fromCharCode low PDF_FROMCHARCODE
    String.fromCharCode found — used to construct payload strings dynamically. Common in benign JavaScript libraries for codepoint manipulation, so this alone is informational; weaponised use is also caught by the dedicated fromCharCode-stage and exploit-shape rules. (matched inside decoded stream)
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://board.eonlineworld.com/notice/dwsrmpa.exe
    • http://www.digicert.com.my/cps.htm0
    • http://cybertrust.omniroot.com/repository.cfm0
    • http://www.public-trust.com/cgi-bin/CRL/2018/cdp.crl0
    • 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
stream_001_off0003a162.js
d5143d101bd3d5f5711b507d0d62b473189a38d21b4b9560b361fbcd59f5d4c7		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3A162 13967 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 2 eval/decoder/string-building token(s). Carved artifact contains 1 long hex-escaped blob(s).
embedded_pdf_0000034a.exe
a1310712ebc51324a38ed64e58f5ce14badb41434731acf371c43537a0176434		 embedded-pe PDF raw stream PE payload at offset 0x34A 36668 bytes
Detection
ClamAV: Win.Trojan.Agent-321623
Obfuscation or payload: unlikely

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