PDF malware analysis — malicious · b5c69c507c47afbc

MALICIOUS

PDF

24.6 KB

MD5: 4a266c4228ba3f701e35ec6568aed855 SHA-1: 76422397e2f727f41fa2118d8e627479905a491c SHA-256: b5c69c507c47afbca16f237c65b971f413efca80d89eebd69bd26b35c31358b3

128 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1059.007 JavaScript

The PDF file contains obfuscated JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT, PDF_JS, and PDF_EVAL with eval() calls. The embedded JavaScript streams, particularly 'javascript_obj0005_000.js', are highly obfuscated but the presence of eval() and String.fromCharCode suggests dynamic code execution. This pattern is typical for downloading and executing further malicious content. The ClamAV detection of 'Heuristics.PDF.ObfuscatedNameObject' further supports the malicious nature of the file.

Heuristics 7

ClamAV: Heuristics.PDF.ObfuscatedNameObject critical CLAMAV_DETECTION

ClamAV detected this file as malware: Heuristics.PDF.ObfuscatedNameObject
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: PSEOF. 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 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0005_000.js` `31f1dedfa160988673cc020ad297d1867476f25367f4a4946771ec1d8842d680`	pdf-javascript-stream	PDF /JS object 5 at offset 0x166	24598 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).
`javascript_obj0005_001.js` `4f33b73dd9b836b44834b051b2db7abd2187108396369507a1d35285f1f87eaa`	pdf-javascript-stream	PDF /JS object 5 at offset 0x166	57 bytes

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