PDF malware analysis — malicious · 1d442c12b30a0a93

MALICIOUS

PDF

37.7 KB

MD5: fd44142653c78f9d0b819675f9cc4cc1 SHA-1: ac871bbb0dd40918be4aa48b667b137a58140224 SHA-256: 1d442c12b30a0a93f8c7078dfaf10343627d184dc5c1a882826afc0245bdc777

124 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF file exhibits multiple indicators of malicious intent, including embedded JavaScript and a Flash object. The ML classifier strongly flags this PDF as malicious. The presence of embedded JavaScript, specifically `javascript_obj0006_000.js`, suggests an attempt to execute code, likely for downloading and executing a second-stage payload. The use of `String.fromCharCode` and ASCIIHexDecode filter further supports obfuscation techniques commonly used in malicious PDFs.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

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` `ce5f7936cf8e3536a88a804ce2d6902022df1794fa878bdc64a26866e34ba989`	pdf-embedded-file	PDF EmbeddedFile object 16 at offset 0xAB1	55839 bytes
`javascript_obj0006_000.js` `fdd9175199ce709e6532d534fb29c7d7e958d075c53010c49f7084d9ae1c0c87`	pdf-javascript-stream	PDF /JS object 6 at offset 0xF5	1552 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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