Malicious PDF — malware analysis report

Static analysis result for SHA-256 68290a8cf0d43aac…

MALICIOUS

PDF

6.3 KB
MD5: 97150104866b0fa058c947cde9c8e644 SHA-1: 11a2c59aa58f82fceb4099ff4524a781986f8640 SHA-256: 68290a8cf0d43aacac8e0f2334d8c51f0f2fc03f7ab3868132ca98ffef992cfe
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, indicated by multiple heuristic firings including 'PDF_JAVASCRIPT' and 'PDF_JS_EXPLOIT_CLUSTER'. The 'PDF_UNESCAPE' heuristic suggests the JavaScript is obfuscated and likely malicious. The ML classifier also flagged the PDF as malicious with a high probability. The primary function of the JavaScript appears to be the execution of an exploit, likely to download and run a secondary payload.

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_off00000324.bin
da55c5d5db8f63c665cefb5644eb50eefdd1759d4e7dd42bf3fca1f2a972a766		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x324 400 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 eval/decoder/string-building token(s).
objstm_0024_00.bin
3eae769688ff7c7d594b2ba8778abb21e619576e5ab94f1785eb1db1af441192		 pdf-objstm-decoded PDF /ObjStm 24 0 obj (inflated) 331 bytes

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