PDF malware analysis — malicious · 051db0d3e33bed07

MALICIOUS

PDF

1.8 KB

MD5: aca8d3433cd083a2f39b673b0c5cabde SHA-1: 9a81c6499b4760c5eda7dd164b9893a89c952054 SHA-256: 051db0d3e33bed0749d35f1b06fbb30399a8667a665e95c4f955c18d18c914e2

218 Risk Score

Malware Insights

MITRE ATT&CK

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

The PDF contains embedded JavaScript that utilizes unescape() to construct shellcode and performs memory spraying techniques. This script is designed to exploit a vulnerability within the PDF viewer, likely to download and execute a secondary payload. The embedded file.pdf also contains suspicious static findings, further indicating malicious intent.

Machine Learning

Nyx PDF Classifier malicious score 0.9765

Heuristics 8

Embedded PDF child has suspicious static findings critical PDF_EMBEDDED_CHILD_STATIC_TRIAGE

PDF contains an embedded PDF stream whose extracted child matches suspicious or malicious PDF heuristics. Wrapper PDFs are commonly used to hide the actual exploit or lure payload from scanners that do not recursively inspect attachments.
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.
unescape() call high PDF_UNESCAPE

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

PDF embeds a file attachment — could carry an executable or another weaponised document as a nested payload
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.
Remote GoTo action info PDF_GOTO_REMOTE

PDF has GoToR/GoToE actions that reference sibling document files — typical of multi-part document bundles
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_obj0005_000.js` `0ebbd9e332546f82cac649a2ea02dcc689c44a58959d59d6f4b0cfc7f4538b14`	pdf-javascript-stream	PDF /JS object 5 at offset 0xEA	1935 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 6 eval/decoder/string-building token(s).
`file.pdf` `3040970fc5ca59366b6d0237cf1a25a2d0d4875b75550bf70d624841a50c38bb`	pdf-embedded-file	PDF EmbeddedFile object 5 at offset 0x1DB	2394 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 6 eval/decoder/string-building token(s).

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