PDF malware analysis — malicious · fdaabd9df5a0533c

MALICIOUS

PDF

15.8 KB

MD5: a6e8f6733f9b38e62e65ca8fdcff1543 SHA-1: efcb78b9325dfb305285b1978e3368a0e2f7c076 SHA-256: fdaabd9df5a0533cab30121b340dadd06803efbbedc8e650fe2606c6bb009aeb

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF file contains embedded JavaScript that utilizes eval() and fromCharCode functions, indicating an attempt to obfuscate malicious code. Heuristics suggest a large comment-padded JavaScript eval stager, commonly used to download and execute further payloads. The ClamAV detection 'Pdf.Exploit.Agent-36086' further supports the malicious nature of the file, pointing towards an exploit targeting PDF vulnerabilities.

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 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0006_000.js` `f2f0fdfee908e5a0913446848d5b8ad708d5ff029c710f87b6c2ec4f8e502f41`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	426375 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).
`legacy_pdfkit_stage_000.js` `f14c12c640a378381e5191afa2670585c78edd76502acde20a4af04afb2e9639`	deobfuscated-js	double percent-decoded annotation JavaScript at offset 0x143	262144 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 641 long base64-like blob(s).

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