PDF malware analysis — malicious · f99ddcf63788682f

MALICIOUS

PDF

3.3 KB

MD5: de7e8274644cdf5e07c8f0658df14996 SHA-1: 3d09ea7869a2abd5c7bec61a19daa2b6b3c8df50 SHA-256: f99ddcf63788682fef33412750758d9d98e2c1be29733d4f07dba766b1084c44

158 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF contains embedded JavaScript and an embedded file, which is flagged as suspicious by multiple heuristics. The ML classifier strongly indicates maliciousness. The embedded JavaScript uses unescape() and appears to be obfuscated, suggesting it's designed to download and execute a second-stage payload. The presence of a secondary embedded PDF further supports a multi-stage attack.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 7

Secondary embedded PDF body has suspicious static findings critical POLYGLOT_CHILD_PDF_STATIC_TRIAGE

A valid PDF body was found at a nonzero offset inside another container and its carved contents matched PDF exploit or lure heuristics. This catches polyglots where the top-level magic routes to ZIP/OLE while a PDF reader or downstream parser opens the hidden PDF payload.
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
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 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`file.pdf` `81fad4b838788162a4d5a6d02a18a94751ab50d6fd4ba1969b54c47797500b53`	pdf-embedded-file	PDF EmbeddedFile object 5 at offset 0x1C5	216 bytes
`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).
`polyglot_child_pdf_off000001c5.pdf` `6993f46060eb8df550a24dbc47ea10926ac7c3a7e3c69931184a8d2703b1f75b`	polyglot-child-pdf	Secondary PDF body inside pdf container at offset 0x1C5	2921 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 6 eval/decoder/string-building token(s).

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