PDF malware analysis — malicious · c2c914dd60841dd3

MALICIOUS

PDF

26.3 KB Created: 2011-72-51 03:25:00 Authoring application: String.fromCharCode

MD5: 4ff90e1dd30891fdf9b2d9031529e48f SHA-1: 1a8139395ecff515d4dff1ee8db44f3c8c32ee2a SHA-256: c2c914dd60841dd37a9423c555fd833696d5874123b9e96a16fa60f2d07f238c

66 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF file contains embedded JavaScript, indicated by PDF_JAVASCRIPT and PDF_JS heuristics. The presence of a PDF_EVAL heuristic firing suggests the JavaScript is obfuscated and likely malicious, attempting to execute arbitrary code. The embedded JavaScript file, javascript_obj0001_000.js, is therefore a primary IOC. The use of String.fromCharCode further supports obfuscation. The overall pattern suggests a malicious PDF designed to exploit vulnerabilities and download further malware.

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_obj0001_000.js` `869543eb9654148dc809ec3084e4bb33fbdd8c592127df1c7ed7c6de51b9b2eb`	pdf-javascript-stream	PDF /JS object 1 at offset 0xA	877 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

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