PDF malware analysis — malicious · 5758a8654f9bf00b

MALICIOUS

PDF

55.3 KB Created: 2009-03-22 08:05:01 Authoring application: UcotTawU (via tQ0gGSWGJ)

MD5: f52e6651458fc0e5eff953844b9774dc SHA-1: 29eb31c814c476f0e86894866073865c88369a22 SHA-256: 5758a8654f9bf00bafa13e5e2a259d5267d536ee47a9e9f996e0b60cfa6da157

96 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF file contains embedded JavaScript, indicated by PDF_JAVASCRIPT and PDF_JS heuristics. The JavaScript stream is heavily obfuscated, utilizing String.fromCharCode and eval() calls, which are flagged by PDF_FROMCHARCODE and PDF_EVAL heuristics. The ML classifier also strongly indicates maliciousness. The primary function of the obfuscated script appears to be downloading and executing a second-stage payload, as suggested by the ML_NYX_PDF_MALICIOUS heuristic and the presence of a large, encoded blob within the extracted artifact.

Machine Learning

Nyx PDF Classifier malicious score 0.9999

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` `dbe7c24cc1d307fedd2eed8f75826e7c8361e4e96deee88fd8507cfab56e2b4d`	pdf-javascript-stream	PDF /JS object 7 at offset 0x23D	55346 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s). Carved artifact contains 6 long base64-like blob(s).

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