Malicious PDF — malware analysis report

Static analysis result for SHA-256 12866edaceaecd31…

MALICIOUS

PDF

85.1 KB
MD5: 1e947f8270f72a0150f98f7def011180 SHA-1: 9d7f5d842e9a77245b1bf230b174a325b9f792e5 SHA-256: 12866edaceaecd31ef71d5b5cc482aef817c223aacb8a80c51984ea076e785e5
158 Risk Score

Malware Insights

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

The PDF sample contains embedded JavaScript, indicated by multiple PDF_JAVASCRIPT and PDF_JS heuristics. The presence of PDF_EVAL and PDF_JS_EXPLOIT_CLUSTER suggests the JavaScript is malicious and likely exploits a vulnerability to achieve code execution. The ML classifier also flagged the PDF as malicious. The primary IOC is the embedded JavaScript file, which is expected to contain the malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8424

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.
  • eval() call high PDF_EVAL
    eval() found — commonly used for obfuscated exploit execution (matched inside decoded stream)
  • 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. (matched inside decoded stream)
  • 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. (matched inside decoded stream)
  • Embedded file low PDF_EMBEDDED
    PDF embeds a file attachment — could carry an executable or another weaponised document as a nested payload (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://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/pdf/1.3/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_001_off00000375.js
d09b3f8531bbd0b9fb1a15b94dac709f7710e3e969ad94204049ce689fed2ee0		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x375 18155 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 eval/decoder/string-building token(s).
objstm_0042_00.bin
e324194cd048d339510dbb2e905b3d4dd544e3e66457eb38e6957ef9fcb256ab		 pdf-objstm-decoded PDF /ObjStm 42 0 obj (inflated) 3331 bytes

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