PDF malware analysis — malicious · 2b0436db2cbb64da

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: 64780c7fa2edeea697f636ad583ec4a2 SHA-1: 76e3a31ae14148b741a22604239ce0adc5f94a93 SHA-256: 2b0436db2cbb64daf70e14ba4114830de5e2e38737034bab643b1b675b4831fa

216 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF file contains embedded JavaScript triggered by the OpenAction, which utilizes eval() and String.fromCharCode. The critical CVE-2007-5659 heuristic indicates the use of Collab.collectEmailInfo to decode and execute JavaScript. This script is designed to download and execute a second-stage payload, as evidenced by the deobfuscated JavaScript stream. The file is likely a downloader for further malicious activity.

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)
Suspicious extracted artifact high 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.
String.fromCharCode medium PDF_FROMCHARCODE

String.fromCharCode found — used to construct payload strings dynamically (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.

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0013_001.js` `96f04eddf9f401bda05dcbd8212f29303d2fbdf64edc7de7eb728923b7aad35b`	pdf-javascript-stream	PDF /JS object 13 at offset 0x3D7	13669 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 4 eval/decoder/string-building token(s).
`numeric_charcode_stage_000.js` `923c294e3eee2e264e2a3fc20dbcda76f1875678c7eaf54eb003f2cc5e2bbe85`	deobfuscated-js	numeric char-code string decoded JavaScript at offset 0x445	4152 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

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