PDF malware analysis — malicious · c9ebc7fdfdb9cc9e

MALICIOUS

PDF

118.5 KB

MD5: b3628302c3384f194a4ab05150f3e162 SHA-1: 897413f7eb8861d1e282621b55394df8bea88056 SHA-256: c9ebc7fdfdb9cc9ef0db57a50abc89d9b3ad89a23a883efe475b8615e71e7163

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious Link T1566.001 Spearphishing Attachment

The PDF file contains embedded JavaScript, as indicated by multiple heuristic firings including 'PDF_JAVASCRIPT', 'PDF_JS', and 'PDF_JS_LARGE_COMMENT_PADDED_EVAL'. The 'PDF_EVAL' and 'PDF_FROMCHARCODE' heuristics suggest that the JavaScript is obfuscated and likely used to execute malicious code. The ClamAV detection 'Pdf.Exploit.Agent-36086' further confirms the malicious nature of the file. The primary attack vector appears to be exploiting a PDF vulnerability to run this JavaScript, which is likely a stager for downloading and executing a further payload.

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` `e939428f02036b552aeab3fc8f99d833a3120cdd8401e7964cb7851da0a7fe8c`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	626184 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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