PDF malware analysis — malicious · 23c1b877efda6cab

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: f299e38528eeea9515241b6c00aa2e95 SHA-1: a5b6d83048582cf0471cd243c5629485ae0230f6 SHA-256: 23c1b877efda6caba11a773175dd7ce7791b92caf5dfcbb287943aa2c1fb0acf

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF file contains embedded JavaScript, triggered by an OpenAction, which utilizes the CVE-2007-5659 vulnerability (Collab.collectEmailInfo). The JavaScript is obfuscated using `String.fromCharCode` and `eval()`, indicating an attempt to hide malicious code execution. This technique is commonly used to download and execute further stages of malware. No specific family could be identified due to the generic nature of the exploit.

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` `e2bdbf49484fa0a231441369e3110cb119fc2533f79b609fb698a8facd372062`	pdf-javascript-stream	PDF /JS object 13 at offset 0x3D7	13163 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` `0efb41bf679c87bbb08cfd9caeeca14a3749691ab1ff9bf56229b49868544388`	deobfuscated-js	numeric char-code string decoded JavaScript at offset 0x445	3924 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

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