PDF malware analysis — malicious · aec91d70cfc16f0d

MALICIOUS

PDF

118.7 KB

MD5: 1af16d54492256e4b00774adcae24760 SHA-1: 876109544ee8c9128de2be7cd9ee52217cdf2177 SHA-256: aec91d70cfc16f0d4237cb585973b21b7a4e3d3645b3fd4a5125a2cb1d6a0fb7

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF file contains embedded JavaScript, including a heavily obfuscated 'eval stager' that uses `String.fromCharCode` and `eval()` calls. This pattern is indicative of a downloader attempting to execute arbitrary code. The ClamAV detection 'Pdf.Exploit.Agent-36086' further supports the malicious nature of the file. The primary attack pattern involves exploiting PDF vulnerabilities to deliver and execute a malicious 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 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0006_000.js` `87017292e000203b8eddb537c3b0260553609311aaa2f2f662a94f55e57c3071`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	626632 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).

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