Malicious PDF — malware analysis report

Static analysis result for SHA-256 799b464c9b331614…

MALICIOUS

PDF

29.6 KB
MD5: 0eacf0bb94acf66f199f5590b0cb60ad SHA-1: ccfcdc0ad8f9a8857b2d0b28ddd6acd4e7da352f SHA-256: 799b464c9b3316149bd82192e7937dfc7db582b0f3bb240bbb5351be0ad28323
294 Risk Score

Malware Insights

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

This PDF file contains embedded JavaScript that utilizes String.fromCharCode to construct a malicious string, likely for obfuscation. The presence of PDF_JS_EXPLOIT_CLUSTER and PDF_RICHMEDIA heuristics, along with an embedded SWF file, indicates an attempt to exploit vulnerabilities and execute code. The JavaScript is highly obfuscated, but the overall pattern suggests it downloads and executes a second-stage payload from the identified URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 11

  • 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.Exploit.Agent-35955 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Exploit.Agent-35955
  • 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.
  • RichMedia (Flash) high PDF_RICHMEDIA
    PDF contains /RichMedia (Adobe Flash) which is a historic exploit vector
  • 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.
  • Embedded file low PDF_EMBEDDED
    PDF embeds a file attachment — could carry an executable or another weaponised document as a nested payload
  • 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)
  • 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://code.flashdynamix.com/AES/aes-decrypt.php
    • http://code.flashdynamix.com/AES/aes-encrypt.php
    • http://ns.adobe.com/xdp/
    • http://www.xfa.org/schema/xci/2.6/
    • http://www.xfa.org/schema/xfa-template/2.6/
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://ns.adobe.com/xap/1.0/
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/sType/ResourceRef#
    • http://adobe.com/AS3/2006/builtin

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
20101297.swf
155cb1ff00e6c687a380ad31d1ca035be4d34d8d46179a65e733a7fef7b99805		 pdf-embedded-file PDF EmbeddedFile object 16 at offset 0x858 53922 bytes
Detection
ClamAV: Pdf.Exploit.Agent-35955
Obfuscation or payload: unlikely
javascript_obj0006_000.js
f38c0ed850dd1900ed2413a9944faf1274783fcc9cd19436d0ca54954c4c8569		 pdf-javascript-stream PDF /JS object 6 at offset 0x106 9262 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 199 eval/decoder/string-building token(s).

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