PDF malware analysis — malicious · 3673201feafd1735

MALICIOUS

PDF

118.5 KB

MD5: 8e57a94853ee6daba29bdf25c03d7e07 SHA-1: 35d2c922fda5808398a72c97a5367b409269149e SHA-256: 3673201feafd1735b8a84d07e6eee763e1a4907470fbb4d295f20a2047f5696e

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1566.002 Spearphishing Attachment

The PDF contains embedded JavaScript, with multiple heuristics indicating obfuscated code and the use of eval() and String.fromCharCode. The presence of 'Large comment-padded JavaScript eval stager' and 'Suspicious extracted artifact' with 'Script obfuscation indicators' strongly suggests the JavaScript is designed to download and execute a second-stage payload. ClamAV detection as 'Pdf.Exploit.Agent-36086' further confirms its malicious nature. The lack of specific IOCs beyond the ClamAV signature and the obfuscated nature of the script prevent a more detailed rationale.

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` `541bc33d805cc3746c40a98e97214ab5df5bad3f124e134843e7a3c61e63ffb2`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	627058 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` `1d49db7d6911e63910529ea19b7194f9be9ab57e44f704aa857a02c3de8d46e3`	deobfuscated-js	double percent-decoded annotation JavaScript at offset 0x143	262144 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 688 long base64-like blob(s).

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