PDF malware analysis — malicious · 4f1ee65d888c9c5c

MALICIOUS

PDF

15.7 KB

MD5: e1b6b1e1a598084d4d05952f8603292c SHA-1: 9b48d24a4083f083217d1577f37a1e798edd2275 SHA-256: 4f1ee65d888c9c5c4bf80e3056d7de0ecbb701f86467007db03b3bac6b58eb6d

196 Risk Score

Malware Insights

MITRE ATT&CK

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

This PDF file contains embedded JavaScript, including a large comment-padded eval stager. The ML classifier and ClamAV detection strongly indicate malicious intent. The primary function appears to be exploiting PDF vulnerabilities to execute arbitrary code, likely for downloading and executing a second-stage payload.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

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` `5d2e691124600a8a6d7e56b005e851c0900d13900ce4346a19fd8fc912908b25`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	424575 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_off00003d1d.bin` `2bdde14cfad83035a636e2721010fba9b78d25c2770431edbec91f0511562dd0`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x3D1D	200 bytes

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