Malicious PDF — malware analysis report

Static analysis result for SHA-256 63eb73e6dfdb36ea…

MALICIOUS

PDF

145.6 KB Created: 2008-05-18 21:50:46 +04:00 Authoring application: PDFCreator Version 0.9.0 (via AFPL Ghostscript 8.53)
MD5: 1b4c5a384ce0875c944612f1eaeb7a3d SHA-1: ac03befad1f77346beb309d1c92a0a30c140eee0 SHA-256: 63eb73e6dfdb36ea4786b4917d3557b5ede541559ea68ff245f94fc904d5ec5c
124 Risk Score

Malware Insights

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

The PDF sample contains embedded JavaScript and triggers heuristics related to PDF JavaScript exploits and XFA forms. This indicates the file is designed to exploit a vulnerability, likely to download and execute a second-stage payload. The benign URLs extracted do not detract from the malicious indicators.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8013

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
  • ASCII85Decode filter (with exploit indicators) low PDF_FILTER_85
    ASCII85 encoding filter present alongside exploit delivery indicators — uncommon outside of obfuscation
  • 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_009_off00021bce.bin
18160695d6a5de65f93e0a8675dcdc679a30a1f44c2f35f4ae4a76c8c8774082		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x21BCE 428 bytes
font_00_sfnt_off000029b7.bin
c0f7df7b4c0e3f7641e38f94f6483d97d081649c36d5f87d3c1a5d82a4132acf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x29B7 32792 bytes

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