Malicious PDF — malware analysis report

Static analysis result for SHA-256 5dd896e3452c830b…

MALICIOUS

PDF

6.4 KB
MD5: b759a3b81681cdaa5ad76c090852b446 SHA-1: c90b732eeb02a1b66d2d925073ef56430798cc49 SHA-256: 5dd896e3452c830b580acd4c980063bfd71116872e51498f41f23b2acccad2df
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 flagged as an exploit cluster, indicating it likely attempts to leverage a vulnerability for execution. The presence of obfuscated JavaScript and the ML classifier's high confidence score suggest a malicious intent, probably to download and execute a second-stage payload. No specific family could be identified, but the technique points towards a common PDF-based malware delivery method.

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
0897ecf17754bd66a903ab37d27df3604f04d2576b1f5d58ba7dbcf74f5dcdb5		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x324 652 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 3 eval/decoder/string-building token(s).
objstm_0024_00.bin
d9979e948d09acd37e2111aacc418e9f89867439deb8aae1d587388066bfcf54		 pdf-objstm-decoded PDF /ObjStm 24 0 obj (inflated) 331 bytes

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