PDF malware analysis — malicious · ff1a4d763e064360

MALICIOUS

PDF

14.1 KB

MD5: 379c3c6532ff2c5151cb6f4d0ecacb51 SHA-1: 711327828ce98c5b5a3609f26d69b71fcef336c5 SHA-256: ff1a4d763e064360d527eafa02405f1cf251d528a4e85f1643c1c4c991493780

86 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings including 'PDF_JAVASCRIPT' and 'PDF_JS'. The 'CLAMAV_DETECTION' heuristic further flags it as suspicious due to obfuscated name objects. The presence of a large, obfuscated JavaScript stream suggests it is designed to perform malicious actions, such as downloading a second-stage payload. The document body was unreadable, so the rationale relies solely on the script and heuristics.

Heuristics 5

ClamAV: Heuristics.PDF.ObfuscatedNameObject critical CLAMAV_DETECTION

ClamAV detected this file as malware: Heuristics.PDF.ObfuscatedNameObject
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_obj0006_000.js` `54f1010aba587021151891404d94a854519254f5abd8c9fa7df52abd481dfd38`	pdf-javascript-stream	PDF /JS object 6 at offset 0x19B	14358 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).

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