PDF malware analysis — malicious · cea7c0b4b273a502

MALICIOUS

PDF

15.7 KB

MD5: 2d636a65446f47727c03c9fcb1285be7 SHA-1: e5de4f2bc0ffd0fb9e55b3392e1c1d5068f6558b SHA-256: cea7c0b4b273a502a0a20c06ae17dade6c9ca9525baee81330d717f7b5a21044

166 Risk Score

Malware Insights

MITRE ATT&CK

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

The PDF contains embedded JavaScript, including a large comment-padded eval stager, indicating an attempt to obfuscate malicious code execution. The presence of eval() and String.fromCharCode heuristics, along with the extracted javascript_obj0006_000.js artifact, strongly suggests the script is designed to download and execute a secondary payload. The ClamAV detection of 'Pdf.Exploit.Agent-36086' further supports this assessment.

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` `800667cd4e4293fcaa16c4f3f37ec988686ad6a86a4742f44029bea6be0d1656`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	425024 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_off00003d13.bin` `9e6703d1ab54489d60883fb79f46734b677f6d11b1d7338f7a09523f6ed9d35c`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x3D13	200 bytes

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