PDF malware analysis — malicious · 2fd44aa3a91e0b83

MALICIOUS

PDF

118.5 KB

MD5: d698072a6762c949f9ad46f5078696ee SHA-1: 151ebb37ea4af569b1fcb53e4e2c680823d761cf SHA-256: 2fd44aa3a91e0b83af620deb2cb6a06d30e02349cf2b4999b90adabe99565ad0

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF contains embedded JavaScript, including a large comment-padded eval stager. Heuristics indicate eval() calls and String.fromCharCode usage, suggesting obfuscated code execution. ClamAV detection as 'Pdf.Exploit.Agent-36086' confirms its malicious nature. The primary attack pattern involves exploiting the PDF reader via JavaScript to download and execute a secondary 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 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0006_000.js` `ce8cc9f64d9f86897ca641324d3d923e83ead645ea4702e84ee58a257715cd15`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	627057 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_001_off0001d692.bin` `a03cca18343952b0c6e727c97a304cbdc7557c83e76f8707f8a693b77b1a669c`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x1D692	300 bytes
`legacy_pdfkit_stage_000.js` `f4b557978ad500648fed75409f872906efc0c96c95ba8e68cef311f33abe1e8e`	deobfuscated-js	double percent-decoded annotation JavaScript at offset 0x143	262144 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 653 long base64-like blob(s).

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