Malicious PDF — malware analysis report

Static analysis result for SHA-256 1898bd2dbd14861a…

MALICIOUS

PDF

6.4 KB
MD5: 6ccd22e5ab9d329e506bdfba0cbf61c9 SHA-1: 942a3ca0ae5fe3cdfea30c477dda1ad22894db16 SHA-256: 1898bd2dbd14861a49ee05d7917bbc03e6ee7e08dd754423d9fb6c641d7e5f68
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 JavaScript stream is obfuscated and uses an 'unescape()' call, suggesting it's designed to bypass detection and execute malicious code. This pattern is typical of a downloader or dropper, aiming to fetch and run a second-stage payload. No specific family could be identified, and the benign URLs present do not indicate malicious intent.

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_off00000325.bin
f799af1b3857227f8ea935a63d0eea64238626fafd25d471a868807cbdf1beb7		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x325 408 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 eval/decoder/string-building token(s).
stream_003_off00000560.bin
f3502ef3e6a7d23ed41991e044a8f7a303fe060dd2847c513a5ad9e32faa2ab8		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x560 442 bytes

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