PDF malware analysis — malicious · 91fb98947a2dd485

MALICIOUS

PDF

31.2 KB

MD5: e648ca5fdfdd49625413209d8c5ece25 SHA-1: a5853cc7119d404cd9b2dc527981afdb8ad5ad9c SHA-256: 91fb98947a2dd485e9904021087eb6ebfda65e7142aae712415162c9f5195562

136 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1566.001 Spearphishing Attachment T1204.002 Malicious File

The PDF file exhibits multiple high-severity heuristic firings, including PDF_RICHMEDIA and PDF_EVAL, indicating the presence of potentially malicious content. Embedded artifacts such as a SWF file and JavaScript streams (legacy_pdfkit_stage_000.js) suggest an attempt to execute code or exploit vulnerabilities. The ML classifier strongly flags this PDF as malicious. The embedded JavaScript likely attempts to download and execute a second-stage payload.

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 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`TyPWoIJRMY.swf` `767382813fc770c9716554c3266b22eee1636037ca964af05acf6ff66db4a27d`	pdf-embedded-file	PDF EmbeddedFile object 16 at offset 0x119A	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` `56c677d783cd6075c36bbbc25e1f985e9b130a39a3012afeee2586b02f1cbda8`	pdf-javascript-stream	PDF /JS object 6 at offset 0xF9	3409 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).
`legacy_pdfkit_stage_000.js` `61206de69cebf02d75eeee7aaa0a2264979255c28e549a5e072e497b61dfd8ae`	deobfuscated-js	split-join delimiter stripped JavaScript at offset 0xDB1	2080 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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