PDF malware analysis — malicious · 21742e1597b63ce4

MALICIOUS

PDF

37.7 KB

MD5: b3c5e19659c22cc98b9e2a8dfd71069a SHA-1: df02c70ddc2ca25c30a3ef495aea0bc181f06fbe SHA-256: 21742e1597b63ce4b9fec6cc4168cfe9d0c7a2b230bd2bb56355f34e481369a8

124 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF file exhibits multiple indicators of malicious activity, including embedded JavaScript, a Flash object, and the use of string manipulation techniques like fromCharCode and ASCIIHexDecode. The presence of an embedded JavaScript file suggests an attempt to execute arbitrary code. The ML classifier strongly flags this PDF as malicious. While the exact payload is not immediately clear from the static analysis, the combination of these elements points towards a delivery mechanism for further exploitation.

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 0xACD	55839 bytes
`javascript_obj0006_000.js` `1fa51f1bff8f22d5083847882544a20e50378c266f6cb2b8539533c0d7ec9bc6`	pdf-javascript-stream	PDF /JS object 6 at offset 0xF5	1582 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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