PDF malware analysis — malicious · e73b5445e9830bda

MALICIOUS

PDF

43.2 KB

MD5: cd49fe7d97610e2ca5e61d51c5699367 SHA-1: 96d41ba55e2ddedfa3a4d9c5c1373b3f8a8d147c SHA-256: e73b5445e9830bda70f0b9473893a954a4b262496cf958ea79d81e7e4d81461e

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript T1204.002 Malicious File T1059.007 JavaScript

The PDF sample contains embedded JavaScript that utilizes eval() and unescape() functions, indicating obfuscated code execution. The critical CVE-2009-4324 heuristic firing suggests exploitation of a known PDF vulnerability via the media.newPlayer object. The embedded JavaScript likely attempts to download and execute a secondary payload, as suggested by the use of unescape() to reconstruct strings that could form URLs or commands. The reconstructed strings include "unescape(\"%u06eb%u06eb%u0b0b%u0019\")" and "unescape(\"%u4141%u4141\")", which are indicative of malicious JavaScript execution.

Heuristics 7

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.
eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution
unescape() call high PDF_UNESCAPE

unescape() found — often used to decode shellcode in PDF JS exploits
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.
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.
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 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0008_000.js` `7a97ac86ccb25ded0688173ad61f89612239618e9cf53c5bbb1ef7f97d96cb3e`	pdf-javascript-stream	PDF /JS object 8 at offset 0x58F	1296 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 10 eval/decoder/string-building token(s).

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