PDF malware analysis — malicious · 26969e41de266e7d

MALICIOUS

PDF

32.3 KB

MD5: b6c5570fc52b18c504cf49f4a6c24293 SHA-1: e0da46dd3025977f09e92b0bb3aa80550873f134 SHA-256: 26969e41de266e7d5732e733790fd201f95a0209fd959ddac5822770c8e9d36c

128 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1059.007 JavaScript

The PDF file contains embedded JavaScript, indicated by multiple PDF_JAVASCRIPT and PDF_JS heuristics. The JavaScript itself is heavily obfuscated, utilizing String.fromCharCode and eval() calls, as flagged by PDF_FROMCHARCODE and PDF_EVAL. The ClamAV detection 'Heuristics.PDF.ObfuscatedNameObject' further supports the malicious nature. The primary function of the obfuscated JavaScript appears to be downloading and executing a second-stage payload, as suggested by the presence of large embedded JavaScript streams and the general behavior of such obfuscated scripts in PDFs. The differential parser failure also points to deliberate obfuscation.

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` `35817a09f9aaf906966f16aa2f68e70c075c27b34d40cc78b169cf67b94bc40f`	pdf-javascript-stream	PDF /JS object 5 at offset 0x15E	32514 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).
`javascript_obj0005_001.js` `9f9df60efd4ef3e1c1dd3c477cb8ccb8cca90068574893425ca372f5a61a618d`	pdf-javascript-stream	PDF /JS object 5 at offset 0x15E	65 bytes

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