PDF malware analysis — malicious · f2a9c1a565165a6c

MALICIOUS

PDF

37.7 KB

MD5: defe7b9dfa762f5fbc8b89c7039728db SHA-1: 1df266a944fc32cbf0dfed2eb04eb59d0805612a SHA-256: f2a9c1a565165a6cccade3abfec479895cf63e9b9abdae927050082f99908bae

124 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript/JScript T1559.002 Component Object Model Hijacking

This PDF file exhibits multiple indicators of malicious intent, including embedded JavaScript, a Flash object, and the use of string decoding techniques. The ML classifier strongly flags it as malicious. The presence of an embedded JavaScript file suggests an attempt to execute code, likely for downloading and executing a second-stage payload. The specific techniques used, such as string decoding and embedded rich media, are common in PDF-based malware delivery.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 7

RichMedia (Flash) high PDF_RICHMEDIA

PDF contains /RichMedia (Adobe Flash) which is a historic exploit vector
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
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.
Embedded file low PDF_EMBEDDED

PDF embeds a file attachment — could carry an executable or another weaponised document as a nested payload
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)
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 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`Adobe.swf` `ce5f7936cf8e3536a88a804ce2d6902022df1794fa878bdc64a26866e34ba989`	pdf-embedded-file	PDF EmbeddedFile object 16 at offset 0xAB1	55839 bytes
`javascript_obj0006_000.js` `69c71340a2605ffd79e89fea6b991a73cc91a3701aed705159234030200b9a1a`	pdf-javascript-stream	PDF /JS object 6 at offset 0xF5	1552 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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