Malicious PDF — malware analysis report

Static analysis result for SHA-256 784d1ebd1faccec2…

MALICIOUS

PDF

788.2 KB
MD5: 88292d7181514fda5390292d73da28d4 SHA-1: fbc3856fd689e1ac0f8fb56bbd7d0a2b8332a928 SHA-256: 784d1ebd1faccec27f98970cc266859eaf5676da1c451e3304fb55435d8c8473
156 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and is identified as an XFA form, a common technique for obfuscating malicious content. The critical heuristic 'PDF_JS_EXPLOIT_CLUSTER' and the 'PDF_ENCRYPTED_WITH_JS' rule indicate that the JavaScript is likely used to exploit vulnerabilities or hide a secondary payload. The benign URLs extracted are likely decoys or related to XFA functionality, not indicative of malicious C2.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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.
  • Encrypted PDF carries /OpenAction — payload hidden from static analysis high PDF_ENCRYPTED_WITH_JS
    PDF declares /Encrypt and also references an executable trigger (/OpenAction). Document encryption hides the JavaScript body and stream contents from static scanners — combined with auto-execution indicators this is a known evasion pattern used to deliver weaponised JavaScript that the analyst cannot inspect without the decryption key.
  • 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/3.0/
    • http://www.xfa.org/schema/xfa-template/2.8/
    • http://www.xfa.org/schema/xfa-data/1.0/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_000_off0006d7f3.js
dcefc16710d335e69f60cdd8a0e174d43939d02eaa8dd4c6d7ce4ca63f06495b		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x6D7F3 289498 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.