Malicious PDF — malware analysis report

Static analysis result for SHA-256 11eac9d07c2835fc…

MALICIOUS

PDF

6.9 KB
MD5: 39e493d3882af1fb9cd3add6644df0b3 SHA-1: 9d55dd46ad781b56b718c34fb58800bde79f9780 SHA-256: 11eac9d07c2835fc815d957e6ebc427bb0f5e9937be3210e94ec2ac77f36acf4
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 code within a decoded stream, indicated by PDF_JAVASCRIPT and PDF_JS heuristics. The PDF_UNESCAPE and PDF_JS_EXPLOIT_CLUSTER firings suggest this JavaScript is used to exploit a known vulnerability in PDF viewers. The ML classifier also flagged the PDF as malicious with high confidence. No URLs or document body text were available for further analysis, but the presence of exploit-related JavaScript strongly suggests a malicious intent to execute further code.

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
952f9cfb3fcc36f338c3993717296be667bdcdd3598cf118e3390f67fcaf78af		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x327 2115 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
a3bb459cb3ee6db350d075da010b224c01d97702fa9bbdc8b7312b8254fd5a52		 pdf-objstm-decoded PDF /ObjStm 24 0 obj (inflated) 331 bytes

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