PDF malware analysis — malicious · d566b7dd1cd58cb4

MALICIOUS

PDF

3.6 KB Created: 2008-07-26 19:43:58 Authoring application: Scribus 1.3.3.12 (via Scribus PDF Library 1.3.3.12)

MD5: a5d0022fb49f5f8b9fbf5c774158bfb6 SHA-1: 86506f0a0a5189179bd048b910546afa10fce6ec SHA-256: d566b7dd1cd58cb44d91498804fc4d1fd39892fc0a768afd55928175414a790c

96 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

This PDF file was flagged as malicious by an ML classifier with a high confidence score. Static analysis revealed embedded JavaScript, including the use of eval() and String.fromCharCode, indicating obfuscated code execution. The presence of a JavaScript stream artifact further supports this. The likely intent is to download and execute a second-stage payload, although the specific URL or mechanism is not directly extractable from the provided evidence.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

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 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0013_000.js` `aa514e32fa43da5018b083a6ebf3c7ce9e3e5e61e65690c12e9e44e51cc970b8`	pdf-javascript-stream	PDF /JS object 13 at offset 0x3CE	4282 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s). Carved artifact contains 4 long base64-like blob(s).

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