Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ea2a8b6c9d185ad…

MALICIOUS

PDF

6.7 KB
MD5: e4b77f55f75e6db55cc2479c3e81042e SHA-1: 047bf464c48fdb462b07f23f74f3293da2df8b83 SHA-256: 5ea2a8b6c9d185ad924191654e0f98cb5203edb1b3a6dbac2f6a9835a74a15bf
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 PDF_JAVASCRIPT and PDF_JS heuristics. The PDF_JS_EXPLOIT_CLUSTER and PDF_UNESCAPE firings suggest that this JavaScript is obfuscated and likely exploits a vulnerability within the PDF reader to achieve code execution. The ML classifier also strongly indicates maliciousness. No specific URLs or further script content were extracted, but the presence of exploit code points to a downloader or dropper functionality.

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
6f11522a798ee624a43e9be11b214148f0685e62ad63e83951ae938bf8566a4b		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x327 2093 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).
objstm_0024_00.bin
3781d61eceb53fbcfa72e8c3dc22a8eb13ef93eebb8def84c2ee076f8941f780		 pdf-objstm-decoded PDF /ObjStm 24 0 obj (inflated) 331 bytes

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