PDF malware analysis — malicious · 4f35c50643565afc

MALICIOUS

PDF

12.4 KB

MD5: 07615b098762d0acaaef8d9a418d3576 SHA-1: fc45250fd1464cd241ebc1b67ce6e845d364adf7 SHA-256: 4f35c50643565afc91cfd1b20b2b22ac49ced19ff54db2eccafdf3e50cd4fe31

146 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

This PDF file was flagged as malicious by a machine learning classifier and ClamAV with the signature Pdf.Exploit.Dropped-94. Static analysis revealed embedded JavaScript within the PDF's metadata and a separate JS stream, indicating an attempt to execute code. The presence of PDF_METADATA_EVAL_STAGER suggests the JavaScript is used to decode and execute further malicious content, likely a downloader for a second-stage payload.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 4

ClamAV: Pdf.Exploit.Dropped-94 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Dropped-94
PDF metadata JavaScript eval stager high PDF_METADATA_EVAL_STAGER

PDF JavaScript reads document metadata fields such as title, subject, or producer, decodes character data with parseInt/String.fromCharCode style helpers, and evals the recovered stage. This is a high-signal exploit-kit staging pattern.
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.

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0076_000.js` `b5d61306f9e165e5dd89f235244ce57cd02fb00dae066e5d6e7cdafd50dd03db`	pdf-javascript-stream	PDF /JS object 76 at offset 0x2F89	331 bytes

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