PDF malware analysis — malicious · aaff0c7e3d87813e

MALICIOUS

PDF

118.6 KB

MD5: adcd9e14ddf3283b6dee2beabc5c9855 SHA-1: 15453a9ca95b96116ff8e47a0a413c883d0ca37f SHA-256: aaff0c7e3d87813e92839e3e41f4193eff1a2c85a45a0328b1f77f42c0276b37

166 Risk Score

Malware Insights

MITRE ATT&CK

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

The PDF contains embedded JavaScript, indicated by multiple heuristic firings including 'PDF_JAVASCRIPT', 'PDF_JS', and critically 'PDF_JS_LARGE_COMMENT_PADDED_EVAL'. The presence of 'eval()' calls and 'String.fromCharCode' suggests obfuscated code designed to execute arbitrary commands. ClamAV detection as 'Pdf.Exploit.Agent-36086' confirms its malicious nature. The primary attack vector is likely the exploitation of a PDF vulnerability to run this JavaScript, which in turn is expected to download and execute a further stage 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` `242ee28c7cb7425c856a2856743c6a1a71be8b923a3d3ec376549a98d0913646`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	626802 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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