Malicious PDF — malware analysis report

Static analysis result for SHA-256 04c3138555e91734…

MALICIOUS

PDF

7.1 KB
MD5: acc151deca726dd8d0cc7e4c805beac3 SHA-1: 9cf13edbb7668a8209869ef16a4c12ad05b644fc SHA-256: 04c3138555e91734561f14a102096b307c5dfc19bf446b058b0c65ab9c46280f
150 Risk Score

Malware Insights

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

The PDF file contains embedded JavaScript that utilizes the unescape() function, a common indicator of exploit code. This JavaScript is likely designed to download and execute a secondary payload. The ML classifier strongly indicates maliciousness, and the combination of JavaScript execution and exploit cluster firings points to a typical PDF-based malware delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9825

Heuristics 6

  • 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.
  • unescape() call high PDF_UNESCAPE
    unescape() found — often used to decode shellcode in PDF JS exploits (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)
  • 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_002_off00000327.bin
273bde08eca4a40b24516d79bf2d17f35c9ad7f2756fa8e6ea9b6a2e119e7469		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x327 2319 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 3 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).
stream_003_off00000825.bin
1d333a69c429ef710c7a0d1554e8efdf9594705b7ca314fac7f29f8007e312c6		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x825 442 bytes

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