PDF malware analysis — malicious · 371aae3f7ded1926

MALICIOUS

PDF

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

MD5: dc4e6931d5af30fc926a38db895e38ee SHA-1: 72a8e41be20e308c6b00036ce015f38313704d7e SHA-256: 371aae3f7ded19265fa6a17efea2fadba461fd9dc7a8dd5e1a2499440092b9d4

226 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF file contains embedded JavaScript that is triggered by the OpenAction. Critical heuristics indicate the use of CVE-2007-5659 (Collab.collectEmailInfo) and CVE-2008-2992 (util.printf), both known methods for executing arbitrary JavaScript within a PDF reader. The JavaScript is obfuscated using numeric character codes and eval(), suggesting it is designed to download and execute a second-stage payload. The file is identified as malicious with a high risk score.

Heuristics 8

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)
util.printf — CVE-2008-2992 critical CVE exact CVE_2008_2992

PDF JavaScript calls util.printf() — CVE-2008-2992 is a stack buffer overflow in Adobe Reader triggered by a long format-specifier argument. Widely exploited in the wild after disclosure. (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` `d0438183ca41652dcfaa8837c73e89a2f63538fa8b56292b7a65137a8f3574b9`	pdf-javascript-stream	PDF /JS object 13 at offset 0x3D7	10960 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` `e5ce2c45e299cea7c805fb2114b5c7bada67a15585e5dd8e652412a78168005e`	deobfuscated-js	numeric char-code string decoded JavaScript at offset 0x437	3173 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

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