PDF malware analysis — malicious · 30b7adc62bb6c76c

MALICIOUS

PDF

12.2 KB

MD5: 66a870cb2d74d642f2652b668b39fe34 SHA-1: 8fe6109ab57825fc4140e2b45d3fdd4da8699a5d SHA-256: 30b7adc62bb6c76cd8d6635ebd4cfb53b767888300ef4026192cf7e655030b68

106 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript/JScript T1566.002 Spearphishing Attachment

The PDF file contains obfuscated JavaScript, indicated by multiple heuristic firings including 'PDF_JAVASCRIPT', 'PDF_JS', and 'PDF_FROMCHARCODE'. The 'CLAMAV_DETECTION' heuristic further confirms its malicious nature. The embedded JavaScript file, 'javascript_obj0007_000.js', is likely responsible for executing the malicious payload, potentially involving the download and execution of a second-stage artifact. The obfuscation suggests an attempt to evade detection.

Heuristics 6

ClamAV: Heuristics.PDF.ObfuscatedNameObject critical CLAMAV_DETECTION

ClamAV detected this file as malware: Heuristics.PDF.ObfuscatedNameObject
ASCIIHexDecode filter (with exploit indicators) medium PDF_FILTER_HEX

Hex-encoding filter present alongside exploit delivery indicators — often used to hide payload or shellcode bytes
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_obj0007_000.js` `48fd40328488895e82b3388bbafdd10c2ecd94df9e5a0b75af24862ea6805349`	pdf-javascript-stream	PDF /JS object 7 at offset 0x19E	12821 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).

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