PDF malware analysis — malicious · c1eb3bc245385df5

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: 0eb6dea4e5ffd1bb18bb8d9ec14fd609 SHA-1: ccf670f7fac82f1079a0e9aad55a966650a196e6 SHA-256: c1eb3bc245385df5b3a4ec1246f31058870b067fcebd17c2e85f6bbc3b976fdf

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript/JScript T1566.002 Spearphishing Attachment T1204.002 Malicious File

The PDF file contains embedded JavaScript triggered by the OpenAction, which is a known method for exploiting PDF vulnerabilities. The critical heuristic firing for CVE-2007-5659 indicates the use of a specific exploit technique involving `Collab.collectEmailInfo` and JavaScript evaluation. The embedded JavaScript streams, particularly `numeric_charcode_stage_000.js`, are heavily obfuscated but contain indicators of script obfuscation, suggesting they are designed to download and execute a secondary payload. The `eval()` call and `String.fromCharCode` usage further support this. The file's creation date and authoring application (Scribus) are likely irrelevant to the malicious functionality.

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` `146939d6223afa2c3d461e1139ef83fff090ed129a31d23ae31d598719be2e81`	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` `9738da73d2aeb8adb27ed43aa5064aa91a1417a719965f3d98940b29c95431c0`	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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