PDF malware analysis — malicious · 3e95e323641e398f

MALICIOUS

PDF

26.6 KB Created: 2011-04-22 17:55:46 +03:00 Authoring application: Loan Shop Online Wiki (via mPDF 5.0)

MD5: 84c19a9d386d31f6ae2c5764d4bc1902 SHA-1: c04f510b4135b1675800afb89a2fbf15b0608810 SHA-256: 3e95e323641e398f05d4af78325fc34e604c9ba13cbd82e1db817ba326bc42e7

76 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF file contains embedded JavaScript streams that are heavily obfuscated using unescape() calls and hex escape sequences. These scripts are indicative of a downloader attempting to fetch and execute additional malicious content. The presence of multiple obfuscated JavaScript objects and the 'unescape()' heuristic strongly suggest this malicious behavior.

Heuristics 4

unescape() call high PDF_UNESCAPE

unescape() found — often used to decode shellcode in PDF JS exploits
Suspicious extracted artifact medium 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.
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.

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0022_000.js` `357d06d70777f397a54fd04180a5ee36f36a8ec5c7cbbafdfab41f20901b25ac`	pdf-javascript-stream	PDF /JS object 22 at offset 0x63C6	136 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 1 long hex-escaped blob(s).
`javascript_obj0022_001.js` `607a0753f2d28ea7a383d2e729ee9a1eeb69db22eafb74fa3e1d444ae047c123`	pdf-javascript-stream	PDF /JS object 22 at offset 0x63C6	134 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 1 long hex-escaped blob(s).

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