PDF malware analysis — malicious · 2846e63e1fc77d8b

MALICIOUS

PDF

118.4 KB

MD5: a1c94b3e639d6fee5ba3ece82c31c921 SHA-1: 530681054a883a95168303d68eb96627af317a9b SHA-256: 2846e63e1fc77d8b00a697b121b720c663f459f630f81243b9abdcb60bedef11

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF contains embedded JavaScript, including a large comment-padded eval stager and multiple eval() calls. This JavaScript is heavily obfuscated and likely responsible for downloading and executing a second-stage payload. ClamAV detection of 'Pdf.Exploit.Agent-36086' further supports its malicious nature. The specific attack pattern is inferred from the common use of such techniques in PDF-based malware delivery.

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` `23ded08a5db2cbf11f7b199765dfb8811d4ea02270a5fc08f46d37845ddc436c`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	627011 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` `79b2a6087d72726b967efe140b333541a32f556f4fc5d24d47f9bcbc3f8d87cc`	deobfuscated-js	double percent-decoded annotation JavaScript at offset 0x143	262144 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 559 long base64-like blob(s).

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