PDF malware analysis — malicious · 3dbae611c5c783fb

MALICIOUS

PDF

20.2 KB Created: 2009-10-08 19:48:79 Authoring application: PDF Library 1.4.7 (via PDF Library 7.4.8)

MD5: 81c936eae23ff2b2dd7665c31f31b81c SHA-1: a49739928c520adc49ea80837adcf8cb835bec08 SHA-256: 3dbae611c5c783fb00a1675d3ada889ed47c9373e8386f6f2c1c6ded69f38de1

96 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 Command and Scripting Interpreter: PowerShell T1059.003 Command and Scripting Interpreter: Windows Command Shell T1059.007 Command and Scripting Interpreter: JavaScript/TypeScript

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT and PDF_JS. The JavaScript stream, named javascript_obj0007_000.js, is obfuscated using unescape() calls and ASCIIHexDecode filters, suggesting an attempt to hide malicious functionality. This obfuscated script is likely responsible for downloading and executing a secondary payload, a common technique for initial access and further system compromise. The high risk score and unknown exploit score further support the malicious nature of the file.

Heuristics 5

unescape() call high PDF_UNESCAPE

unescape() found — often used to decode shellcode in PDF JS exploits (matched inside decoded stream)
ASCIIHexDecode filter (with exploit indicators) medium PDF_FILTER_HEX

Hex-encoding filter present alongside exploit delivery indicators — often used to hide payload or shellcode bytes
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 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0007_000.js` `fdcb297ef3983623e162c225f55d6fe30e6373941e1cfe555351b283adec7319`	pdf-javascript-stream	PDF /JS object 7 at offset 0x268	22082 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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