PDF malware analysis — malicious · cab0d5dfc88a1f92

MALICIOUS

PDF

3.5 KB Created: 2008-31-20 53:85:00 Authoring application: Scribus 1.3.3.12 (via Scribus PDF Library 1.3.3.12)

MD5: c54859ae4e779daa656f9eb704ce9cfc SHA-1: ee9db4d4d580b084edfb5829e4358b3002283130 SHA-256: cab0d5dfc88a1f928d38c83494d7d6e20d85640bd69f8e0914b8b99a7b9eb03a

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript T1204.002 Malicious JavaScript T1059.003 Windows Command Shell

The PDF file contains embedded JavaScript that is triggered by the OpenAction. Heuristics indicate the use of eval() and String.fromCharCode, along with a specific CVE-2007-5659 exploit targeting the Collab.collectEmailInfo function. This suggests the script is designed to deobfuscate and execute a malicious payload, likely a downloader. The extracted JavaScript files confirm the presence of obfuscated code and potential exploit vectors.

Heuristics 7

Collab.collectEmailInfo — CVE-2007-5659 critical CVE exact CVE_2007_5659

PDF JavaScript calls Collab.collectEmailInfo — CVE-2007-5659 is a buffer overflow in Adobe Reader triggered by a long argument or heap-sprayed message field passed to Collab.collectEmailInfo(). Part of a series of Acrobat JS API exploits. (identified after JavaScript deobfuscation)
OpenAction trigger high PDF_OPENACTION

PDF has an /OpenAction — code runs automatically when opened
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.
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_obj0013_001.js` `d1f664e0de53edb6cf597e08f5cbeb4d524cfc22a7e300e5de739c039f8c7b5c`	pdf-javascript-stream	PDF /JS object 13 at offset 0x3D7	13543 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).
`numeric_charcode_stage_000.js` `d373e25b6f5f8c5d51e48d230aab2ca55624bce3c87ac0b2ceefb43dc26e7667`	deobfuscated-js	numeric char-code string decoded JavaScript at offset 0x445	4044 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

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