PDF malware analysis — malicious · 8fb200655fd9e4b6

MALICIOUS

PDF

6.4 KB

MD5: e335f3612cd043e874ded82c6ad33796 SHA-1: f23103c57c3bb86769e0090298971c17168fb1d3 SHA-256: 8fb200655fd9e4b64fe53ae0661c7271a8dca7de4ba214cf1a45f080ea87938e

94 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF contains embedded JavaScript that utilizes eval() and String.fromCharCode(), indicating an attempt to obfuscate and execute malicious code. The ML classifier also flagged this PDF as malicious. While no specific IOCs like URLs or hashes were extracted, the techniques used suggest the execution of a second-stage payload.

Machine Learning

Nyx PDF Classifier malicious score 0.9833

Heuristics 5

eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution (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. (matched inside decoded stream)
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. (matched inside decoded stream)
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)
Embedded URL info EMBEDDED_URL

One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
URL http://www.w3.org/1999/02/22-rdf-syntax-ns#
- http://ns.adobe.com/xap/1.0/
- http://purl.org/dc/elements/1.1/
- http://ns.adobe.com/xap/1.0/mm/
- http://ns.adobe.com/pdf/1.3/

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`objstm_0024_00.bin` `9a8b92746a07be45c0c868d862161bb187a8fdf9044915248a558b27968a45bc`	pdf-objstm-decoded	PDF /ObjStm 24 0 obj (inflated)	503 bytes

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