PDF malware analysis — malicious · 1b98955376d065b6

MALICIOUS

PDF

37.7 KB

MD5: bf969e19c631775a2af1140371e001c3 SHA-1: 3cf06bdb80e2ce1b978b9d7e0fe5c32c2db5c9f8 SHA-256: 1b98955376d065b6b34735c13e9b3cf54d39773dbaaa3c72ff4846facfcf3e8e

124 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1559.002 Component Object Model Hijacking T1204.002 Malicious File

This PDF file was flagged as malicious by an ML classifier and contains embedded JavaScript and Flash content. The presence of these elements, along with heuristics indicating JavaScript actions and potential exploit indicators in the ASCIIHexDecode filter, suggests an attempt to execute malicious code. The embedded javascript_obj0006_000.js file is a primary indicator of malicious activity, likely serving as a downloader or initial execution vector.

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 0xAAB	55839 bytes
`javascript_obj0006_000.js` `dca15ef2087eec4e42d737c625b81ea22183c7c012e43bbfa424c8a29331ffd9`	pdf-javascript-stream	PDF /JS object 6 at offset 0xF5	1546 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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