PDF malware analysis — malicious · 7531714d2ae4bcc3

MALICIOUS

PDF

3.7 KB Created: 2008-07-26 19:43:58 Authoring application: Scribus 1.3.3.12 (via Scribus PDF Library 1.3.3.12)

MD5: 7aa48997771eadeab28850576d2219b7 SHA-1: 17215e00651198e6f72948f8a29f2107fecb4c84 SHA-256: 7531714d2ae4bcc3819853a765c824fc527d511332d1371c0c04ab771b51cf14

336 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 JavaScript T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript that utilizes the 'Collab.collectEmailInfo' method, a known indicator for the CVE-2007-5659 exploit. The JavaScript is obfuscated and uses eval() and String.fromCharCode() to decode and execute a payload. This exploit cluster is critical and has been flagged by multiple detection engines, including ClamAV. The primary function of the script appears to be downloading and executing a secondary stage, as indicated by the exploit cluster and the presence of deobfuscated JavaScript.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 9

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)
PDF JavaScript exploit cluster critical PDF_JS_EXPLOIT_CLUSTER

PDF combines an executable JavaScript/action surface with exploit staging indicators such as eval/unescape/fromCharCode, XFA script content, or a related CVE pattern. Benign form JavaScript remains low-severity, but this correlated cluster is high-confidence malicious behavior.
ClamAV: Pdf.Exploit.Agent-35551 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Agent-35551
ClamAV detection on extracted artifact critical EXTRACTED_FILE_CLAMAV

ClamAV flagged at least one file extracted from inside this sample. Even when the wrapping document carries no AV detection of its own, a hit on the carved artifact is a strong indicator the sample is a delivery vehicle.
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_000.js` `01bc0c7d25aaaba964abf7602feae1b704a89eeb60e05a2c41dd3abb6a3b005f`	pdf-javascript-stream	PDF /JS object 13 at offset 0x3CE	3847 bytes
Detection ClamAV: Pdf.Exploit.Agent-35551 Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).
`acroform_b64_00.js` `42374b773ed88580dc581ad323183d4deb83137b900c531e6216b0fe280600ca`	deobfuscated-js	PDF AcroForm base64 (decompressed) at offset 0x772	2226 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).

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