Malicious PDF — malware analysis report

Static analysis result for SHA-256 83a9ae109abce617…

MALICIOUS

PDF

145.4 KB Created: 2008-05-18 21:50:46 +04:00 Authoring application: PDFCreator Version 0.9.0 (via AFPL Ghostscript 8.53)
MD5: 323acf2444516311bd32ad300ca20e6f SHA-1: 9999bfc859d8acc4c7978752e498a621f63992e3 SHA-256: 83a9ae109abce617a7a4605620c862c3a24de7e952abbbd0540c1d51325720b0
124 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF file contains embedded JavaScript and is flagged as an exploit cluster, specifically leveraging XFA forms. The ML classifier indicates a high probability of maliciousness. The JavaScript is likely used to download and execute a second-stage payload, although the specific actions are obfuscated.

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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