PDF malware analysis — malicious · 862ed627f73d9c3c

MALICIOUS

PDF

30.7 KB

MD5: f15bcfdf6896644d79168c5b4f71bb66 SHA-1: 31604213fa3c9957d996074e0f85596e104d856a SHA-256: 862ed627f73d9c3c49d1a4c010a971bd6e56254619454961c333fcd2e440c65a

136 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1566.002 Spearphishing Attachment

The PDF file exhibits multiple high-severity heuristic firings, including PDF_JAVASCRIPT, PDF_JS, PDF_EVAL, and PDF_RICHMEDIA, indicating the presence of executable code and potentially exploitable content. The ML classifier strongly flags this PDF as malicious. Embedded artifacts include a SWF (Flash) file and a JavaScript file, suggesting a multi-stage attack. The JavaScript eval() call is particularly concerning as it often indicates obfuscated or dynamically generated malicious code.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 6

RichMedia (Flash) high PDF_RICHMEDIA

PDF contains /RichMedia (Adobe Flash) which is a historic exploit vector
eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution
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
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
`mtESxVNI.swf` `767382813fc770c9716554c3266b22eee1636037ca964af05acf6ff66db4a27d`	pdf-embedded-file	PDF EmbeddedFile object 16 at offset 0xFE8	26993 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 7.98, consistent with packed or encrypted content.
`javascript_obj0006_000.js` `626839fb55af546ddc52864b3247408eb977ccf170a4335fb819cde923c7802a`	pdf-javascript-stream	PDF /JS object 6 at offset 0xF9	2981 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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