PDF malware analysis — malicious · 73484d116c713e2b

MALICIOUS

PDF

4.1 KB

MD5: 9573cbc2952348f352de60735d50d52e SHA-1: 036cdd02ae0f0be23a236e8928f6af54c3d29ed3 SHA-256: 73484d116c713e2b8529189e808e46acae2247aad0508f553dc2aa2497de7742

196 Risk Score

Malware Insights

MITRE ATT&CK

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

The PDF file contains embedded JavaScript that utilizes the unescape function and constructs a large string of unicode characters, indicative of an exploit attempt. The embedded 'exploit.swf' file and the JavaScript stream suggest the sample is designed to download and execute a secondary payload, likely a Flash exploit or a downloader. The ML classifier strongly flags this PDF as malicious.

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.
RichMedia (Flash) high PDF_RICHMEDIA

PDF contains /RichMedia (Adobe Flash) which is a historic exploit vector
unescape() call high PDF_UNESCAPE

unescape() found — often used to decode shellcode in PDF JS exploits
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.
Embedded file low PDF_EMBEDDED

PDF embeds a file attachment — could carry an executable or another weaponised document as a nested payload
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
`exploit.swf` `12847488e067678316075e6fda0fd375b72ce9d2a92edf04188dc0ea9aee26cc`	pdf-embedded-file	PDF EmbeddedFile object 14 at offset 0x4D1	624 bytes
`javascript_obj0017_000.js` `6b623da6e0763a3ef8fab4c5579f0ec4f2446b96f6c0e0eebf65e7799cd01217`	pdf-javascript-stream	PDF /JS object 17 at offset 0x7F5	1659 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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