PDF malware analysis — malicious · 96665dea8500432d

MALICIOUS

PDF

1017.1 KB Created: 2009-05-11 20:47:27 +08:00

MD5: 03940878de4a806cc8097151a631262a SHA-1: 81848ebd164f85aa227195256b35f584c41cd45d SHA-256: 96665dea8500432da208bb54f63cf2ea8e18eed3f34871356d110ed170242985

114 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1059.007 JavaScript

The PDF contains embedded JavaScript streams, with one stream exhibiting significant obfuscation and the use of eval() and String.fromCharCode(). This strongly suggests the script is designed to download and execute a secondary payload. The ML classifier also flagged this PDF as malicious with high confidence. No specific family could be identified due to the generic nature of the obfuscation.

Machine Learning

Nyx PDF Classifier malicious score 0.9954

Heuristics 9

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.
XFA form low PDF_XFA

PDF uses XML Forms Architecture — can contain script logic
Embedded file low PDF_EMBEDDED

PDF embeds a file attachment — could carry an executable or another weaponised document as a nested payload (matched inside decoded stream)
String.fromCharCode low PDF_FROMCHARCODE

String.fromCharCode found — used to construct payload strings dynamically. Common in benign JavaScript libraries for codepoint manipulation, so this alone is informational; weaponised use is also caught by the dedicated fromCharCode-stage and exploit-shape rules. (matched inside decoded stream)
PDF paints image(s) but contains no text operators info PDF_IMAGE_ONLY_LURE

PDF has 1 image XObject(s) and the content stream contains no text-emitting operators (BT/ET, Tj, TJ, ', ") in either raw bytes or decompressed streams — this is the screenshot-as-PDF pattern used to bypass text-based scanners and to deliver instructions purely through rendered pixels. It is informational unless paired with invisible links or risky URI context.
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/xap/1.0/
- http://ns.adobe.com/pdf/1.3/
- http://purl.org/dc/elements/1.1/
- http://ns.adobe.com/xap/1.0/mm/
- http://ns.adobe.com/pdfx/1.3/
- http://www.w3.org/1999/xhtml
- http://www.xfa.org/schema/xfa-data/1.0/

Extracted artifacts 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0034_000.js` `97e6c8fb70f6fedab160a41095c99dce3c9d53a0086d3a8d4e6d47cbe03dce61`	pdf-javascript-stream	PDF /JS object 34 at offset 0xF76B7	1946 bytes
`javascript_obj0063_001.js` `b724ebc62d6d42a8641e225407c2ce6c2e532c37fcfe9d07b44571a82c380eeb`	pdf-javascript-stream	PDF /JS object 63 at offset 0xFC4D4	22180 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).
`objstm_0037_00.bin` `b428c2f4870fae0526567cf77c099cf670e2322887bfea6ea9524203cd643431`	pdf-objstm-decoded	PDF /ObjStm 37 0 obj (inflated)	48 bytes
`objstm_0059_00.bin` `926ac9d40938e4da7655ca1cedb2c842082fc0e24db16e7dc1e576b82a7966df`	pdf-objstm-decoded	PDF /ObjStm 59 0 obj (inflated)	58 bytes

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