PDF malware analysis — malicious · ca021e2f29fe1b28

MALICIOUS

PDF

2.6 KB

MD5: 1b9c800d5916e7f45ac1c039604bbda2 SHA-1: 6b4aa8f6aec44460a799e46186269d8382d4407e SHA-256: ca021e2f29fe1b287baa47b0ebeb48832101b7a1e0a6699a2220c0d2780f6099

96 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

This PDF file was flagged as malicious by a machine learning classifier with high confidence. Static analysis revealed embedded JavaScript streams, including one that utilizes eval() and String.fromCharCode() for obfuscation. The presence of these JavaScript functions strongly suggests the execution of arbitrary code, likely to download and execute a second-stage payload. No specific family could be identified due to the obfuscation.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 5

eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution (matched inside decoded stream)
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.
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
`javascript_obj111711_000.js` `6d2aa8aabf0a1733f26bba32ada4f774e5e624c274be7e536c6a360499d843cb`	pdf-javascript-stream	PDF /JS object 111711 at offset 0x197	2532 bytes
`javascript_obj111712_001.js` `81195d61c1cda97820d5230c30e1f9583cb8ef15e7e7d968551bbfe646277b0c`	pdf-javascript-stream	PDF /JS object 111712 at offset 0x89A	528 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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