PDF malware analysis — malicious · 79c223624b18604b

MALICIOUS

PDF

4.5 KB Created: 2008-08-06 01:42:27 Authoring application: Scribus 1.3.3.12 (via Scribus PDF Library 1.3.3.12)

MD5: d32fe11393a4f8619424e85d7d7cee9e SHA-1: bf0e1aed2a377963fbb6ace91c9bcb541bc4b17a SHA-256: 79c223624b18604b45adf2b94d63e04a6a0bb43b7a6add40bdbb33dad1ecb75c

66 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1059.007 JavaScript

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT, PDF_JS, and PDF_EVAL. The `eval()` call and `String.fromCharCode` usage within the decoded stream suggest obfuscated code execution. The presence of `acroform_b64_00.js` and `javascript_obj0013_001.js` as extracted artifacts further supports the use of JavaScript for malicious purposes. The primary intent appears to be the execution of obfuscated JavaScript, likely to download and execute a second-stage 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_obj0013_001.js` `1004c020f5ae40872323a4c7c354cd18fbb6b5c3f221b15f2320c7eb7d85b508`	pdf-javascript-stream	PDF /JS object 13 at offset 0x366	6205 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 4 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).
`acroform_b64_00.js` `6c52e3b82f98ecaeb0722ce886e8a181f188c3058d9fe5579466d920a20a406a`	deobfuscated-js	PDF AcroForm base64 (decompressed) at offset 0x6EF	4012 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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