Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ad73547b82668bd…

MALICIOUS

PDF

6.8 KB
MD5: cd8201657270ec4d8a3ca60b601d5e54 SHA-1: f9b14b2f4bf19ee9362db24cd0213ddc82cfc239 SHA-256: 0ad73547b82668bd16b5ea77815cd0fcdcb6ee05b960b84d3d5a8a11df417d1b
150 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 critical PDF_JS_EXPLOIT_CLUSTER firing, combined with PDF_UNESCAPE, strongly suggests the JavaScript is malicious and exploits a known vulnerability. The ML classifier also flagged the PDF as malicious with high confidence. The JavaScript's likely purpose is to download and execute a secondary payload, a common technique for initial access via spearphishing attachments.

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
792b15fbe2c9f3ebb1d79bffb4e9fd9584cdc0916261c7ad3bc6dfa731095667		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x327 1909 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 2 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).
objstm_0024_00.bin
a523c8d97382a87f9ae0533a7f69460b8e5c3e548b14ef472b808c9e8a650c89		 pdf-objstm-decoded PDF /ObjStm 24 0 obj (inflated) 331 bytes

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