Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c3a632c8c90ef56…

MALICIOUS

PDF

7.0 KB
MD5: 718a04f9300fdc16ffa2ac3cb3856da1 SHA-1: 8a2d1f33204ef64a9d543f73acb1aafe5521409a SHA-256: 0c3a632c8c90ef567c92b7d8726d2fd9947fb6ed726de7e003c2ee33818d764a
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, as suggested by the 'PDF JavaScript exploit cluster' heuristic. While several URLs are present, they are all confirmed benign namespaces, and no malicious IOCs were directly extracted from the document body or scripts.

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
00baff543c2766fb4ca8f92e66467342aa5a9e0ea835fd47bbc247c4d48483d2		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x327 2324 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).
objstm_0024_00.bin
b81413e4f8aa3a22685732e1491966a9e2a88f8be16cf05db44ecf080e0c2289		 pdf-objstm-decoded PDF /ObjStm 24 0 obj (inflated) 331 bytes

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