Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e0082b2c539a6fb…

MALICIOUS

PDF

6.8 KB
MD5: dd3d07eced69452158fb8d3306fc1e4f SHA-1: 20ff51e1be52252984e48c62f6d9344c3d16fc15 SHA-256: 0e0082b2c539a6fb121ec49d63991b67617a32e568d72d60100b89a57ad7eff2
150 Risk Score

Malware Insights

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

The PDF file contains JavaScript that is obfuscated and uses the `unescape()` function, indicating an attempt to exploit a vulnerability. The critical heuristic 'PDF_JS_EXPLOIT_CLUSTER' further supports this. The presence of JavaScript points to the T1059.007 (JavaScript) technique. Given the nature of PDF exploits, T1203 (Exploitation for Client Execution) is also relevant. The overall pattern suggests a malicious document delivered via spearphishing (T1566.001) intended to download and execute a further stage.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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
1e4d14c36a7ed8b05909912340bd1e770c29588ab7ffa4cf137dc061ebc3c838		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x327 1948 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
809a55e1c0b021b2e5e3335c6e32bdbff627df673c42ad70301c34319879e9d3		 pdf-objstm-decoded PDF /ObjStm 24 0 obj (inflated) 331 bytes

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