PDF malware analysis — malicious · b4f0e04a2b797974

MALICIOUS

PDF

15.7 KB

MD5: d19dac69a41d05ea9f6172da29a06076 SHA-1: 11bccfb3853209ab867d2d1beb78f55c0621fe7c SHA-256: b4f0e04a2b79797407eda8cdf22d0cf25b586217d1386094867f142ec2d5dd9a

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF contains embedded JavaScript, including a large, obfuscated stager that utilizes eval() and String.fromCharCode. This pattern is indicative of a downloader attempting to execute arbitrary code. The ClamAV detection 'Pdf.Exploit.Agent-36086' further supports the malicious nature of the file, suggesting it's a known exploit targeting PDF vulnerabilities. The primary intent appears to be the execution of a malicious script, likely to fetch and run additional malware.

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` `6099b8ef58ede8ba770ce09f4ced7de66d3556d2d38153982e3af410d06cee60`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	425156 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` `141e3d64dc915f02f0b40cf048728799f794b327038720d9dd20f6533be108d3`	deobfuscated-js	double percent-decoded annotation JavaScript at offset 0x143	262092 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 455 long base64-like blob(s).

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