PDF malware analysis — malicious · 25d7a4d345b66f7c

MALICIOUS

PDF

1.6 KB

MD5: 3411c7c1c9fd8398a96b9ef85de1167f SHA-1: 78e0768df4ca0e9cf8a3aceed2a4d795b5a75355 SHA-256: 25d7a4d345b66f7c93696e60c25753344cc06a520424d541e0c091a0efc0122a

126 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 Command and Scripting Interpreter: PowerShell T1566.001 Phishing: Spearphishing Attachment T1204.002 Malicious File Execution: Malicious File

This PDF file contains embedded JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT and PDF_JS. The JavaScript stream utilizes eval() and String.fromCharCode(), suggesting obfuscation to hide its true functionality. The primary purpose appears to be the execution of this script, which is extracted as 'javascript_obj0009_000.js', likely to download and execute a second-stage payload or perform other malicious actions.

Heuristics 6

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 (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_obj0009_000.js` `b2d5bc3bcf914934600b9a4456c2b76ac1897dde6e696aa47dcb1dd7eab671d5`	pdf-javascript-stream	PDF /JS object 9 at offset 0xDC	3909 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).

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