PDF malware analysis — malicious · c704b78eaf939658

MALICIOUS

PDF

4.3 KB

MD5: b19a6125904bf8fafb37651cf4eaea69 SHA-1: 35c82f70ea3d7829fcb9073650a0312f75cb0db1 SHA-256: c704b78eaf939658c4f75c9c7b9092764ff5195b23f75dfe1f05b51839a2ef3d

134 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF file contains embedded JavaScript that is obfuscated using `eval()` and `String.fromCharCode()`. The critical heuristic indicates exploitation of CVE-2009-0927 via a `Collab.getIcon` call, which is used to decode and execute JavaScript. This suggests the document attempts to download and execute a second-stage payload. No specific malware family is identifiable from the available evidence.

Heuristics 7

Collab.getIcon — CVE-2009-0927 critical CVE exact CVE_2009_0927

PDF JavaScript calls Collab.getIcon — CVE-2009-0927 is a stack buffer overflow in Adobe Reader triggered by Collab.getIcon() with a crafted argument. Allows arbitrary code execution. (identified after JavaScript deobfuscation)
eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution (matched inside decoded stream)
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.
Additional-actions dictionary low PDF_AA

PDF defines /AA (Additional Actions) that references an executable action (JS/JavaScript/Launch/SubmitForm) — can auto-trigger on document or widget events. Form-field calc/format/validate/keystroke handlers in legitimate interactive forms commonly fire this, so it is reported as a low-weight signal; weaponised auto-execution is flagged by stronger rules (PDF_OPENACTION, encrypted-with-JS, etc.)
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
`javascript_obj0005_000.js` `7ba94b9b5a30aa82b670e274279e61ac9d854d8b90231bd95b321578537b5264`	pdf-javascript-stream	PDF /JS object 5 at offset 0x132	23966 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).
`numeric_charcode_stage_000.js` `c0741d6ba1155434eee37310ab6b300bc069c47b54785de7d1392262e28a3b52`	deobfuscated-js	numeric char-code string decoded JavaScript at offset 0x140	7055 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 4 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).

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