Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c887e2f2b1493b5…

MALICIOUS

PDF

69.9 KB
MD5: c66fbed86625b5a642c4508967b4d918 SHA-1: db1b828088ee5f94f3bb84e189a7ab92b084cc30 SHA-256: 6c887e2f2b1493b57c3a199f6c1b8eb9a4ee10b4751ea247640a4f689d4d6317
176 Risk Score

Malware Insights

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

The PDF file contains embedded JavaScript that is flagged as an exploit cluster, specifically linked to XFA forms and the CVE-2013-3353 vulnerability. The JavaScript code is heavily obfuscated but its structure suggests it is designed to download and execute a secondary payload from a remote source. The presence of an unknown reputation URL further supports this malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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: Pdf.Exploit.CVE_2013_3353-1 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Exploit.CVE_2013_3353-1
  • 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0013_000.js
b0b0afb09618e82f565c46676390e9fc033343861f76b04a258a9d85f20b835e		 pdf-javascript-stream PDF /JS object 13 at offset 0x10502 3806 bytes
javascript_obj0013_001.js
9907c53353e66aa6d960d02a4e25d65bb4cb6c19b9190ac6d0c1f741c3a8d3e3		 pdf-javascript-stream PDF /JS object 13 at offset 0x10526 4718 bytes

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