PDF malware analysis — malicious · ea38c297763d35ed

MALICIOUS

PDF

2.2 KB

MD5: 8ae526c83d8dcfd8deb026903573a6b5 SHA-1: 794d604255cb98f5293d9b6372f6eee17fc96752 SHA-256: ea38c297763d35ed60c950746e1c74dd6c7e346acbdfcf9cd6670cc9c49b3bc5

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file is a PDF containing embedded JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT, PDF_JS, PDF_EVAL, and PDF_UNESCAPE. The ClamAV detection of 'Pdf.Exploit.Agent-36082' strongly suggests malicious intent. The embedded JavaScript, particularly the use of eval() and unescape(), is characteristic of exploit delivery mechanisms within PDFs. While the exact payload is not detailed, the presence of these indicators points to an attack pattern involving the exploitation of PDF vulnerabilities to run malicious code.

Heuristics 7

ClamAV: Pdf.Exploit.Agent-36082 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Agent-36082
eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution (matched inside decoded stream)
unescape() call high PDF_UNESCAPE

unescape() found — often used to decode shellcode in PDF JS exploits (matched inside decoded stream)
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_obj111611_000.js` `772da696bdb365f3f1eb4ea6af881baad391be62f3591b19f2f9827fcc4c9b53`	pdf-javascript-stream	PDF /JS object 111611 at offset 0x7DE	479 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).
`legacy_pdfkit_stage_000.js` `e7478d13b8dcaafb5be6c9b8b74b0331f0b4edb330e59bd6ae9a95d231f62781`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x189	2822 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).

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