PDF malware analysis — malicious · 5e8fd5bbfdb9d1d5

MALICIOUS

PDF

3.9 KB

MD5: 5aec130f38dcb29bb5f0e4039af05b34 SHA-1: 0e57e3bbf7e23820597e950c01c5c8adef606e88 SHA-256: 5e8fd5bbfdb9d1d55cca80d9a4ad9be8b9fa849ca11aef1c056ee1442016f465

202 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 JavaScript T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The critical heuristic 'PDF_JS_EXPLOIT_CLUSTER' combined with multiple PDF-specific JavaScript and filter decoding rules indicates the sample is designed to exploit a PDF vulnerability. The ML classifier and ClamAV detection strongly support this, flagging it as a known exploit. The embedded JavaScript, likely obfuscated, is the primary mechanism for executing malicious code, suggesting it acts as a downloader for further stages.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 7

PDF JavaScript exploit cluster critical PDF_JS_EXPLOIT_CLUSTER

PDF combines an executable JavaScript/action surface with exploit staging indicators such as eval/unescape/fromCharCode, XFA script content, or a related CVE pattern. Benign form JavaScript remains low-severity, but this correlated cluster is high-confidence malicious behavior.
ClamAV: Pdf.Exploit.Agent-36178 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Agent-36178
ASCIIHexDecode filter (with exploit indicators) medium PDF_FILTER_HEX

Hex-encoding filter present alongside exploit delivery indicators — often used to hide payload or shellcode bytes
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)
ASCII85Decode filter (with exploit indicators) low PDF_FILTER_85

ASCII85 encoding filter present alongside exploit delivery indicators — uncommon outside of obfuscation

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