PDF malware analysis — malicious · 0a51261bd7b43451

MALICIOUS

PDF

7.1 KB

MD5: 5858e8522b14adc0e6b2430082a263f8 SHA-1: eabc2002b27a08cd6b2264aae7decc9e4eaa9353 SHA-256: 0a51261bd7b43451b7f8e339715a6f6bf73670101cc570debcdb0bd8901bf6ef

196 Risk Score

Malware Insights

MITRE ATT&CK

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

The PDF sample contains embedded JavaScript that utilizes `unescape()` and heap spraying techniques, strongly indicating an exploit attempt. The presence of an embedded SWF file further suggests a multi-stage attack. The JavaScript function `spray_heap` constructs a large string using `unescape` and concatenates it, likely to overwrite memory and achieve code execution. This points to a common PDF exploit pattern.

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` `49b04eca9be01c285a55c8ebf6d33b686ebd88925f5f524951dc74928b300173`	pdf-embedded-file	PDF EmbeddedFile object 14 at offset 0x4D5	3764 bytes
`javascript_obj0017_000.js` `96a97d349c8e38558926d17b9a1f3b23253538a4bd7a680a5bc362e4790dfb94`	pdf-javascript-stream	PDF /JS object 17 at offset 0x143D	1643 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

Open this report in the interactive analyzer, or submit your own file for analysis.