PDF malware analysis — malicious · d4145fae5f9e2d17

MALICIOUS

PDF

3.0 KB Created: 2008-08-03 07:51:49 -09:03 Authoring application: Adobe InDesign CS3 (5.0) (via Adobe PDF Library 8.1)

MD5: f1a7e803441f4219e6aff081998335ce SHA-1: 64a7ffe285d9a402d88f51d0a435cd07942433fb SHA-256: d4145fae5f9e2d174cbb740e0cdbf9af8eb2b6d635b8430d24d10a937ae05cfe

88 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF document contains embedded JavaScript, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. The ML classifier strongly suggests maliciousness. The JavaScript stream, identified as javascript_obj0013_001.js, likely contains obfuscated code designed to exploit vulnerabilities or download further payloads, as suggested by the PDF_UNESCAPE firing and the ML_NYX_PDF_MALICIOUS heuristic. The exact intent of the script is unclear due to obfuscation, but its presence in a PDF with a high malicious score points to a delivery mechanism for further compromise.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 4

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.
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_obj0013_001.js` `3f6060fdd59ba5fb78b14f48aeb4d71f9f46b25ddd48f2531975301595027c8c`	pdf-javascript-stream	PDF /JS object 13 at offset 0x362	2628 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 4 eval/decoder/string-building token(s).

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