PDF malware analysis — malicious · 7a3fc8bf285d0f36

MALICIOUS

PDF

37.7 KB

MD5: 21e7944325afc2d375f1fff7bbdfd966 SHA-1: 5157314a21415a6c78fbf467aea84fe9e7b4ff36 SHA-256: 7a3fc8bf285d0f3695a216907d20b3f95c28dddec5ef4161da73696fd9ed05dc

126 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 and Flash content. The ML classifier strongly flagged this PDF as malicious. The presence of a JavaScript stream, identified as 'javascript_obj0006_000.js', suggests an attempt to execute code. The embedded Flash (SWF) file is also a common vector for exploiting vulnerabilities. The combination of these elements points to a likely attack pattern involving the exploitation of PDF reader vulnerabilities or the execution of malicious scripts to download and run further payloads.

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 0xAC5	55839 bytes
`javascript_obj0006_000.js` `590f8c4aa01c96f7a66b8098a9d9639c0a9886ba9549ac5567df5b54ac05a447`	pdf-javascript-stream	PDF /JS object 6 at offset 0xF5	1576 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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