PDF malware analysis — malicious · fcaa400ba4c3fe64

MALICIOUS

PDF

118.6 KB

MD5: 032495d439e79322502f15351b9e9599 SHA-1: 0d1c6e3605a061b41e8c05b737545cfa46954886 SHA-256: fcaa400ba4c3fe6427e474a8fa95d760a375d7c611d5d32e1eccffd6857a876d

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT, PDF_JS, and PDF_FROMCHARCODE. A critical heuristic, PDF_JS_LARGE_COMMENT_PADDED_EVAL, suggests a stager pattern commonly used to download and execute further payloads. ClamAV detection as 'Pdf.Exploit.Agent-36086' further confirms its malicious nature. The exact payload or C2 infrastructure is not directly discernible from the provided evidence, leading to an 'unknown family' classification.

Heuristics 7

ClamAV: Pdf.Exploit.Agent-36086 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Agent-36086
eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution (matched inside decoded stream)
Large comment-padded JavaScript eval stager high PDF_JS_LARGE_COMMENT_PADDED_EVAL

PDF JavaScript contains a very large stream padded with long random-looking block comments around String.fromCharCode and eval. This is an exploit-kit obfuscation shape used to bury a decoder and recovered stage inside noise, not normal PDF form automation.
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` `4e7d1c78c322b6862996f9c7ca064ee9ee1ca0e18d7592938b1e95074fe4c635`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	626784 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s). Carved artifact contains 42 long base64-like blob(s).

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