PDF malware analysis — malicious · 93c12dd50c509b8c

MALICIOUS

PDF

118.6 KB

MD5: 98e07bdea6d62ade7f85eaf4ae620efe SHA-1: 80be5c86603b7b34ca7c6bc6ffb64c92b8528c1e SHA-256: 93c12dd50c509b8c48626654fb87dd4d7273670f056ad2f34d2a7beadf6d0460

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1059.007 JavaScript

The PDF contains embedded JavaScript, including a large comment-padded eval stager. This JavaScript is heavily obfuscated and uses `eval()` and `String.fromCharCode()`, indicating it is designed to execute arbitrary code. The ClamAV detection 'Pdf.Exploit.Agent-36086' and the heuristic 'Suspicious extracted artifact' further support that this PDF is an exploit delivery mechanism. The primary intent appears to be downloading and executing a second-stage payload, as suggested by the obfuscated JavaScript stager.

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` `854f2e4d25b788d74a06f051a0e75928e4caac14db7dc988e56c621e564e8f39`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	626632 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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