PDF malware analysis — malicious · a8de53f92b3d3854

MALICIOUS

PDF

23.7 KB Created: 2009-08-21 06:04:14 Authoring application: chuqqlraejb (via djojlxjkemiq)

MD5: 2c986cd621127a94d3cca9a573a90f38 SHA-1: e4edfd74dd15fa368e3f12060410cde733b6fbde SHA-256: a8de53f92b3d38541760540af66cc4175d049a3def96d226cf75579a274f9f9f

100 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1059.007 JavaScript

The PDF file contains embedded JavaScript, flagged by multiple heuristics including PDF_JAVASCRIPT, PDF_JS, and PDF_EVAL. The ML classifier also strongly indicates maliciousness. The JavaScript appears obfuscated, using String.fromCharCode and eval(), making it difficult to fully deobfuscate the exact download URL. However, the presence of these techniques strongly suggests the script's intent is to download and execute a second-stage payload. The document body is minimal and does not provide further context.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 6

eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution
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.
PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED

The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PSSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
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_obj0012_000.js` `035157c83f416413cf1c8f4ad5f6fe70dd2cb6687cb40e86a89c9f33df00d1e9`	pdf-javascript-stream	PDF /JS object 12 at offset 0x348	22759 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).

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