PDF malware analysis — malicious · 093e3d45e85a607c

MALICIOUS

PDF

2.11 MB Created: 2009-12-16 21:48:21 Authoring application: PDF Editor - Foxit Software

MD5: 7fbfc1af7359daa480f97d1fba48c363 SHA-1: 11dbb119b9ac622e64f9957b4503aee73ece4679 SHA-256: 093e3d45e85a607c8ff7f462d4121431dfaaa7152df2f26dbb50b722a1b9c033

226 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF file contains embedded JavaScript that utilizes unescape() and String.fromCharCode() functions, indicative of obfuscation and exploit attempts. Critical heuristics indicate exploitation of CVE-2009-4324 via media.newPlayer, and a JavaScript exploit cluster. The embedded JavaScript likely serves as a dropper for further malicious activity.

Machine Learning

Nyx PDF Classifier malicious score 0.9991

Heuristics 9

media.newPlayer — CVE-2009-4324 critical CVE exact CVE_2009_4324

PDF JavaScript calls media.newPlayer — CVE-2009-4324 is a use-after-free in Adobe Reader's multimedia plugin triggered by media.newPlayer(). Actively exploited as a zero-day in December 2009. (matched in decompressed stream)
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.
unescape() call high PDF_UNESCAPE

unescape() found — often used to decode shellcode in PDF JS exploits (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.
Embedded file low PDF_EMBEDDED

PDF embeds a file attachment — could carry an executable or another weaponised document as a nested payload
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.

Extracted artifacts 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0009_000.js` `a1ea4d9b70c078224a51dbf8a5c198730e17a2c2962ec54ccf10ce99c903207d`	pdf-javascript-stream	PDF /JS object 9 at offset 0x21C803	3583 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 4 eval/decoder/string-building token(s).
`javascript_obj0014_001.js` `0adad2a915ee0405d60c16305dd5bbbfde6301a10e197b96f2610cfa06e22fa8`	pdf-javascript-stream	PDF /JS object 14 at offset 0x21C28A	3585 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 4 eval/decoder/string-building token(s).
`combined_document_js_000.js` `f68d27c6d1067be6d03cf71fe9ba0276162577ee4a56035d2ae066904bd3e9ad`	deobfuscated-js	combined document JavaScript streams at offset 0x21C803	7169 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 8 eval/decoder/string-building token(s).

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