PDF malware analysis — malicious · 1bdd6ac9a99b1d8e

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: 34ee8ab9e0e9945bab5f85a799d30551 SHA-1: 0d2678223206814b722f03042705056d417dce35 SHA-256: 1bdd6ac9a99b1d8e49ad8dd6e6821a38d7227d2ddd5c272c5572b444e141dac5

226 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript/JScript T1204.002 Malicious File

The PDF file contains embedded JavaScript triggered by the OpenAction, which is a known technique for exploiting PDF viewers. The critical heuristic CVE_2007_5659 indicates the use of a specific exploit targeting the Collab.collectEmailInfo function, which decodes and evaluates JavaScript. This script is likely designed to download and execute a second-stage payload, as suggested by the ClamAV detection of Pdf.Dropper.Agent-7235647-0. The obfuscated nature of the script and the use of fromCharCode further support this dropper behavior.

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)
ClamAV: Pdf.Dropper.Agent-7235647-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Dropper.Agent-7235647-0
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` `9532742bd27d2d548193449631e24548fbd953127889bf348162ae83a9180ddf`	pdf-javascript-stream	PDF /JS object 13 at offset 0x3D7	13391 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` `0f118b29fe5208c21ded6233e21c7d5c08808e7d9214aab662fd42f01887d7d3`	deobfuscated-js	numeric char-code string decoded JavaScript at offset 0x445	3996 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

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