PDF malware analysis — malicious · 71b274d17185760f

MALICIOUS

PDF

12.5 KB

MD5: c6047d30c21fcfd3d3618f0518eca95a SHA-1: 140ce640de94f3039f561af208079debeb342107 SHA-256: 71b274d17185760ffb28e1a250a17aaa7702fe1c3946fcc11ec0ae3b3221cf41

146 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF file contains embedded JavaScript within its metadata, which is designed to decode and execute a payload. The script reconstructs a string by concatenating characters from a lookup table, ultimately evaluating the resulting string. This indicates an attempt to download and execute a second-stage malicious file, consistent with a phishing attachment.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 4

ClamAV: Pdf.Exploit.Dropped-94 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Dropped-94
PDF metadata JavaScript eval stager high PDF_METADATA_EVAL_STAGER

PDF JavaScript reads document metadata fields such as title, subject, or producer, decodes character data with parseInt/String.fromCharCode style helpers, and evals the recovered stage. This is a high-signal exploit-kit staging pattern.
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 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0076_000.js` `11c9372f41fb49df74d5689422b262a92c1d71ea9a8e1d279332e0e11cff2139`	pdf-javascript-stream	PDF /JS object 76 at offset 0x3009	331 bytes

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