Malicious PDF — malware analysis report

Static analysis result for SHA-256 6573c65cadcc8b5c…

MALICIOUS

PDF

45.0 KB
MD5: dc477ab0a6f7e66a403ef8cb533c6c46 SHA-1: c5c827fb5dec77dfdd886d29d2681abbaae51a1d SHA-256: 6573c65cadcc8b5c8319f6e0bb8c392d124c7aaefb994fa1ade51a96e3878990
118 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, flagged as a critical exploit cluster associated with XFA forms. The JavaScript code, though obfuscated, appears to be designed to download and execute a second-stage payload. The presence of a suspicious embedded JavaScript file and the ML classifier's high confidence score indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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.
  • 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.
  • 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.
  • XFA form low PDF_XFA
    PDF uses XML Forms Architecture — can contain script logic
  • 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.bitstream.com
    • http://ns.adobe.com/xdp/
    • http://www.xfa.org/schema/xci/2.6/
    • http://www.xfa.org/schema/xfa-template/2.6/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0012_000.js
9918a802b97718c7432a4ac93b8b200b53bb3c5ca484efb84c9dd862e40ee011		 pdf-javascript-stream PDF /JS object 12 at offset 0xA0B9 4060 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).
font_00_sfnt_off0000033c.bin
df212d16737593e02f82d7092b78b350eced25ae7f8008cf101ab221d3f31489		 pdf-font-stream PDF embedded font (sfnt) at offset 0x33C 65932 bytes

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