PDF malware analysis — malicious · 86a95c56ba76f7ab

MALICIOUS

PDF

118.7 KB

MD5: bae428d8bcdfed10041caed730595787 SHA-1: 03c391073196ff99050cdb9fbab8e564c3deb349 SHA-256: 86a95c56ba76f7ab5154d3f9f724bf24f810ba3e0de20a6f6f1948c2d28e7a67

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The file is identified as a malicious PDF by ClamAV with the signature 'Pdf.Exploit.Agent-36086'. Static analysis revealed embedded JavaScript with multiple obfuscation techniques, including `eval()` calls and `String.fromCharCode`, indicating an attempt to hide malicious code execution. The presence of a 'Large comment-padded JavaScript eval stager' further suggests a complex exploit delivery mechanism. While the exact payload is not discernible from the provided evidence, the heuristics strongly point to a PDF-based exploit designed to compromise the user's system.

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` `f07f716f42fbe5808b1caabc599c65e0460af048b9a2f2693619ccecaf98785d`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	626279 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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