PDF malware analysis — malicious · d0fbede24fa8cdbe

MALICIOUS

PDF

3.9 KB

MD5: 81e0fc5a730b774d68e6620b5db30f32 SHA-1: 6182be284af4a4d5767814cf9a4cce7bf2219d74 SHA-256: d0fbede24fa8cdbe8ddef6384a22163a58117afb79a609ab27ab675aa3564966

66 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF file contains embedded JavaScript, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. The presence of a PDF_EVAL heuristic firing suggests the JavaScript code is obfuscated and likely uses eval() to execute arbitrary code. Additionally, a PDF_FROMCHARCODE heuristic indicates string manipulation commonly used in obfuscation. The extracted JavaScript files, 'javascript_obj111711_000.js' and 'javascript_obj111712_001.js', are suspicious artifacts. The overall behavior points to a downloader or dropper mechanism, where the embedded script is responsible for fetching and executing a secondary malicious payload.

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` `613644a380812a3de80b9ec58b11fd2f44870b66d0322cc2e51349a6a9211d2f`	pdf-javascript-stream	PDF /JS object 111711 at offset 0x197	256 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).
`javascript_obj111712_001.js` `3928cac47530f066365b271845506023013ccac3f5bd6923b013a598e683827e`	pdf-javascript-stream	PDF /JS object 111712 at offset 0x267	5428 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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