PDF malware analysis — malicious · 21a11dd9f804f2cc

MALICIOUS

PDF

37.7 KB

MD5: ffaa6628cedc3b6158eb279f2806db21 SHA-1: ddf1a659b5a22f2b305755d4af520536b52f14b1 SHA-256: 21a11dd9f804f2cc4dc76d1f3d4144dc2ad7fc14e3e444d08cafbbb59c1d8fe8

94 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF file contains embedded JavaScript and a Flash object, indicating an attempt to exploit vulnerabilities. The heuristic firings for PDF_JAVASCRIPT, PDF_JS, and PDF_RICHMEDIA strongly suggest malicious code execution. The embedded JavaScript file, 'javascript_obj0006_000.js', is a key artifact that likely contains the malicious payload. The exact intent of the script is unclear due to potential obfuscation, but its presence within a PDF with exploit indicators points to a delivery mechanism for further compromise.

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
`embedded_file_obj0016.bin` `ce5f7936cf8e3536a88a804ce2d6902022df1794fa878bdc64a26866e34ba989`	pdf-embedded-file	PDF EmbeddedFile object 16 at offset 0xAB9	55839 bytes
`javascript_obj0006_000.js` `ac76937a49e9f5592da8a93e26266b64b3bbf89af7687f759afad24e73c40c97`	pdf-javascript-stream	PDF /JS object 6 at offset 0xF5	1570 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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