PDF malware analysis — malicious · d2acff7bccf9f277

MALICIOUS

PDF

118.5 KB

MD5: d9f39f2cca439422020dab8f7543bf7a SHA-1: 3481a08c942ec5816ab192581e5af52c6387e5b3 SHA-256: d2acff7bccf9f2774a2303062f028902cff877b8b5c7db4256adbc41513f7efc

196 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript T1204.002 Malicious File T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, including obfuscated code that utilizes eval() and String.fromCharCode. Heuristics indicate a large comment-padded JavaScript eval stager, and ML classification strongly suggests malicious intent. ClamAV also detected this as 'Pdf.Exploit.Agent-36086'. The primary attack pattern involves exploiting PDF vulnerabilities to run this script, which is likely designed to download and execute a second-stage payload.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

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` `6d3b79ef4cd6d90a2bc90f3bb54dcd74a9118bd476de0a6ac97b027316f26427`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	627509 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` `0034f386f3200473e2e858d1b8d62a59cc3858a0ab74a47d7fbf50c91de166e7`	deobfuscated-js	double percent-decoded annotation JavaScript at offset 0x143	262144 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 703 long base64-like blob(s).

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