PDF malware analysis — malicious · 2684487f99351837

MALICIOUS

PDF

42.1 KB Authoring application: PyPDF2

MD5: f374e798a43e385a6f6670e6672c2bf4 SHA-1: e720b8e29025baadd1e605f1ca62172da1f24d76 SHA-256: 2684487f9935183725a29c0793a536b2bf4ab38c8ad031ff71dacc2a4631c6f1

146 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1027 Obfuscated Files or Information

The PDF file contains multiple embedded JavaScript streams, flagged by heuristics for JavaScript actions, embedded JS streams, eval() calls, and unescape() calls. The ML classifier also strongly indicated maliciousness. The extracted artifacts suggest obfuscated JavaScript, likely designed to download and execute a second-stage payload. The specific obfuscation techniques and the lack of clear URLs prevent a more precise family attribution.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 5

eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution
unescape() call high PDF_UNESCAPE

unescape() found — often used to decode shellcode in PDF JS exploits
Suspicious extracted artifact medium 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.
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.

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0011_000.js` `f9dc60f4f605cb8a90b6909df9aa0889afef27503c7d08747adeeaeac5fc2f07`	pdf-javascript-stream	PDF /JS object 11 at offset 0x3F8	23346 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s). Carved artifact contains 8 long hex-escaped blob(s).
`javascript_obj0011_001.js` `4c8f234333f46b8dc95bdc3100fe2838faea294991918d9346a004019752e79b`	pdf-javascript-stream	PDF /JS object 11 at offset 0x3F8	13046 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 1 long hex-escaped blob(s).

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