PDF malware analysis — malicious · 4a3f3416c6f0e800

MALICIOUS

PDF

16.8 KB Created: 2010-03-04 14:18:46 Authoring application: i8Z3ssRqiXDp4F (via YsnDMk)

MD5: 9a12315697db58ef1e2117cb881d55a4 SHA-1: 82ca189e56b0d3e387b85dcc4f26c700769c3394 SHA-256: 4a3f3416c6f0e80073efe69c09549a55ac13b39213a257bd0cdc4e85f88e3682

66 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT, PDF_JS, and PDF_EVAL. The JavaScript stream, named 'javascript_obj0007_000.js', is obfuscated and uses String.fromCharCode and eval() calls, suggesting it's designed to execute arbitrary code. The primary intent appears to be the execution of a second-stage payload, though the exact nature cannot be determined due to obfuscation.

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.
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 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0007_000.js` `97c6df41a0a880747e71db491891ddb7190a6eb4b105cc0f089f77de5aaffc94`	pdf-javascript-stream	PDF /JS object 7 at offset 0x237	15961 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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