PDF malware analysis — malicious · ed4bf7a33f582a1f

MALICIOUS

PDF

15.8 KB

MD5: d38c5573730e152f1fa2f67e0d761841 SHA-1: 482d0f6d21a023bbd734488476be5f45b5be804d SHA-256: ed4bf7a33f582a1fe59735df7ddd1ef5f8c48e5178a7df3b769ca20599a4eabf

166 Risk Score

Malware Insights

MITRE ATT&CK

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

The PDF file contains embedded JavaScript, including a large comment-padded eval stager. This indicates the file is designed to execute malicious code, likely downloading and running a second-stage payload. ClamAV detection as 'Pdf.Exploit.Agent-36086' further supports its malicious nature. The lack of readable document body text prevents a more specific determination of the lure, but the technical indicators point to a common exploit delivery mechanism.

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` `8a7bc326c56401fdd1cecb6aa85f47128b250d78f2ba5fbe4041ca0efab8530e`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	425149 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).
`stream_002_off00003d33.bin` `cb2cb7125778048bb509a9710b4e46d58d71c7cc9cdbed8a0f84e719538e0057`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x3D33	200 bytes

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