PDF malware analysis — malicious · 4bc0be37ceb577fb

MALICIOUS

PDF

4.0 KB

MD5: 3fccb9c96b3ecdcc036dbaf0896b6c1d SHA-1: 4172b1332f568021e83effdb011bb23213316fab SHA-256: 4bc0be37ceb577fb20cb27b3789bd83f45ea47ecb31f8637d77cd0446d8faef5

126 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1105 Ingress Tool Transfer

The PDF file contains obfuscated JavaScript, including calls to eval() and String.fromCharCode, indicating an attempt to hide malicious code. The embedded JavaScript streams are likely responsible for downloading and executing a secondary payload, as suggested by the heuristic firings and the presence of multiple JavaScript files. The ClamAV detection for 'Heuristics.PDF.ObfuscatedNameObject' further supports the malicious nature of the sample.

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 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0006_000.js` `c9fa28df144c5c92e3d79f19387c948bb054a42cefd0a879f99a604a8d338111`	pdf-javascript-stream	PDF /JS object 6 at offset 0x1D1	3367 bytes
`stream_000_off000001f8.js` `6e9476c2b3f1eb17167d37c967c12239ffa6dd15068b9753b64332158cb1f3cd`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x1F8	24719 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 4 eval/decoder/string-building token(s). Carved artifact contains 55 long base64-like blob(s).
`acroform_b64_00.js` `47aee16beb62087bd71eb9c2abf549d7367a2f62fe15a34e63fc8e3944f4e22b`	deobfuscated-js	PDF AcroForm base64 (decompressed) at offset 0x756	1208 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

Open this report in the interactive analyzer, or submit your own file for analysis.