PDF malware analysis — malicious · 3beeff5d7aca010c

MALICIOUS

PDF

15.7 KB

MD5: de74cfec439fc0b3a42303dd7a7a1978 SHA-1: 6cb4051d4aadef45a0e86947c4f60e630d1df41a SHA-256: 3beeff5d7aca010c86cef39cc5bc5e031d3d735e0bfcf94fe2ab70d9a5055f60

196 Risk Score

Malware Insights

MITRE ATT&CK

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

This PDF file contains embedded JavaScript, including a large comment-padded JavaScript eval stager. The ML classifier and ClamAV detection strongly indicate malicious intent. The JavaScript is likely responsible for downloading and executing a second-stage payload, as suggested by the 'eval()' call and 'String.fromCharCode' usage within the script. The presence of a suspicious extracted JavaScript file further supports this.

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` `0045396a4eee186e7eb1cb31e7bcc2e3a5ea341ee2f9abc0eade7131f23f74ea`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	424488 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_off00003cf5.bin` `deee601b8471e1347a1ef8b3b5c0a03abac8745f89f89d540935f72962e86f35`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x3CF5	200 bytes

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