Malicious PDF — malware analysis report

Static analysis result for SHA-256 046fac517908dd72…

MALICIOUS

PDF

45.9 KB
MD5: d3eecef73fe8f36eb49b1d376a133892 SHA-1: a504e9ff19aed2c63d90735626cb99687b2f8839 SHA-256: 046fac517908dd72acfca49b668ded3aa105d177bba72e1ee93e2b8e22f9f18e
176 Risk Score

Malware Insights

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

The sample is a PDF file that contains obfuscated JavaScript, triggering multiple PDF-specific heuristics related to JavaScript exploits and XFA forms. The embedded JavaScript is designed to exploit a vulnerability, likely leading to the download and execution of a secondary payload. While the specific URLs found are benign, the presence of exploit code indicates malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9608

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.
  • ClamAV: Heuristics.PDF.ObfuscatedNameObject critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Heuristics.PDF.ObfuscatedNameObject
  • 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://ns.adobe.com/xdp/
    • http://www.xfa.org/schema/xci/2.6/
    • http://www.xfa.org/schema/xfa-template/2.6/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0012_000.js
978ce57cd0de5fb215fae57c3f0bc950426e1842a01f5bf3b252b101e28e4351		 pdf-javascript-stream PDF /JS object 12 at offset 0xA1C4 4305 bytes

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