PDF malware analysis — malicious · 1f3ca2bc9cf852de

MALICIOUS

PDF

54.2 KB

MD5: 25b9fdac297bb158ca4f22855e781a95 SHA-1: 3b800e6b3f41c9b990d01797ca5f5b5a58111053 SHA-256: 1f3ca2bc9cf852de5c66c5488c2fb4da717d3101a7fd204443ef68c919e0fa2a

126 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1204.002 Malicious File

The PDF contains embedded JavaScript and a Flash object (Adobe.swf), both flagged as suspicious. The ML classifier strongly indicates maliciousness. The embedded JavaScript and Flash object likely work in concert to exploit a vulnerability or download and execute a secondary payload. The presence of these embedded objects suggests a multi-stage attack.

Machine Learning

Nyx PDF Classifier malicious score 0.9999

Heuristics 7

RichMedia (Flash) high PDF_RICHMEDIA

PDF contains /RichMedia (Adobe Flash) which is a historic exploit vector
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.
Embedded file low PDF_EMBEDDED

PDF embeds a file attachment — could carry an executable or another weaponised document as a nested payload
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)
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
`Adobe.swf` `8c702f60d07ed3fe21053014a9ab550df3fd5b001b6f071ffedd8bb7b9881feb`	pdf-embedded-file	PDF EmbeddedFile object 16 at offset 0xAB3	52522 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 7.89, consistent with packed or encrypted content.
`javascript_obj0006_000.js` `5b1165f32ea821f03b88bcd247c7f145c3087db87c76f33867565261ae5a78e8`	pdf-javascript-stream	PDF /JS object 6 at offset 0xF5	1558 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.