Malicious PDF — malware analysis report

Static analysis result for SHA-256 1578b7f00efa640d…

MALICIOUS

PDF

253.5 KB Created: 2004-02-24 14:03:59 -05:00 Authoring application: Presentation Agent (via PDFlib 3.02 (C++/Win32))
MD5: f51843311428b92050e77ff547015f50 SHA-1: 36bdb184719302ce402b3b91bcf9b4faed6d4431 SHA-256: 1578b7f00efa640d660a5724cbc9709615842a18b07f37a07d7870ea4a422b7d
150 Risk Score

Malware Insights

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

The PDF contains multiple JavaScript streams, with one stream containing an eval() call and flagged as a JavaScript exploit cluster. This indicates an attempt to execute malicious code. The document body contains form fields and references to 'submit.asp', suggesting a form submission or data exfiltration attempt. The JavaScript also contains a URL to Adobe's Acrobat Reader download page, likely as a lure or to check for vulnerable versions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6876

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.
  • eval() call high PDF_EVAL
    eval() found — commonly used for obfuscated exploit execution (matched inside decoded stream)
  • 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.
  • Suspicious extracted artifact info EXTRACTED_FILE_STATIC_TRIAGE
    One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.
  • 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.w3.org/1999/02/22-rdf-syntax-ns#
    • http://ns.adobe.com/iX/1.0/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/t/pg/
    • http://purl.org/dc/elements/1.1/
    • http://www.adobe.com/products/acrobat/readstep.html

Extracted artifacts 8

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0639_000.js
5fbb818d39fca6831cc9b8544e01460b2a7cd7fd31dc8345f7e390ebeccc1723		 pdf-javascript-stream PDF /JS object 639 at offset 0x1278B 40 bytes
javascript_obj0640_001.js
e9c611d7504d90ccb0d1dd5c7c166c6d8f21cd961b7db44ac5023ce88cec5ba7		 pdf-javascript-stream PDF /JS object 640 at offset 0x127E5 39 bytes
javascript_obj0641_002.js
ae95d6581723cae0c2c1e3044a60f6c91e032264799b53449cd6269e6993d7bc		 pdf-javascript-stream PDF /JS object 641 at offset 0x1283E 38 bytes
javascript_obj0642_003.js
617ef4da07d9bc9d4e06a2320fe0d4cbacd3d6c2cc82039cf4e79e7facf7545f		 pdf-javascript-stream PDF /JS object 642 at offset 0x12896 41 bytes
javascript_obj0914_004.js
e4ac14492cf504c432d344255c4af84f939a623c5eaf17f271815d08b57922f4		 pdf-javascript-stream PDF /JS object 914 at offset 0x1879B 1075 bytes
javascript_obj0441_005.js
cf531628e85e0c4d985c1051137a151316c53316a866ccf73c6685f02c73ab19		 pdf-javascript-stream PDF /JS object 441 at offset 0x2A2E9 101252 bytes
javascript_obj0916_006.js
05ca45d3c653c1b223262061c11b2fb16561241b3c1e2443229c53bb43f0c9be		 pdf-javascript-stream PDF /JS object 916 at offset 0x18CA9 42 bytes
stream_012_off0002a2e9.js
b788f3e5d2bdc319307993fcf659d0a75745a7ceded736ab2ab79a19c90c1bb3		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2A2E9 50625 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 6 eval/decoder/string-building token(s).

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