Malicious PDF — malware analysis report

Static analysis result for SHA-256 6918bda416c31228…

MALICIOUS

PDF

53.7 KB
MD5: a692b9651a3405f37d2c91b307b29719 SHA-1: 9d593d1416a619c95ce61716a3913b0a9eac4874 SHA-256: 6918bda416c31228cbb5c6273289dab8b8cd4feb10bf856e31fad041e12cc2a6
116 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, identified as a PDF JavaScript exploit cluster, which is designed to execute arbitrary code. The JavaScript streams are heavily obfuscated, but the presence of exploit-related heuristics and the ML classifier strongly indicate malicious intent. The primary IOC is the benign-reputed URL, which may be a lure or a fallback.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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
  • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0012_000.js
b36729e562ae5950392d7017562e6dc724945ff3e62abf1e82e6026b105d7bca		 pdf-javascript-stream PDF /JS object 12 at offset 0xC3C2 4000 bytes
javascript_obj0012_001.js
b5ced1c97bc824d780a238cdcb01d57f24ea5dd2acd90e6d2271c33601c84abc		 pdf-javascript-stream PDF /JS object 12 at offset 0xC3E4 4886 bytes
font_00_sfnt_off0000032f.bin
c997cd621eceaae0b23f11878cad012143132de37494033a952daae8f4b9f945		 pdf-font-stream PDF embedded font (sfnt) at offset 0x32F 49224 bytes

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