PDF malware analysis — malicious · 2c3f31adfdf0396f

MALICIOUS

PDF

12.2 KB

MD5: 4ce491c66039d2dd576ea71662d35800 SHA-1: a0f174f85a7f4f971f78bb4f8631ff76a9273e76 SHA-256: 2c3f31adfdf0396ff1fda85f76cd0682c4583ac84afb9f2fb9dd7c6200499a57

106 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF file exhibits significant obfuscation, including the use of ASCIIHexDecode filters and String.fromCharCode, as indicated by multiple heuristic firings. An embedded JavaScript stream was extracted, which is likely responsible for the malicious behavior. The obfuscated nature of the script and the lack of clear document body text prevent a more precise determination of the attack's intent or a specific malware family attribution. The primary IOC is the extracted JavaScript file.

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` `5217a90425bf19cbe6e21c97f96fb5c232ecafc3e004b1b7a2e404601c106cb9`	pdf-javascript-stream	PDF /JS object 7 at offset 0x19E	12823 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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