PDF malware analysis — malicious · e447214cbbb4115e

MALICIOUS

PDF

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

MD5: 52e5be864df7322d81e90c051e195c72 SHA-1: b596547fccce88a1b8ec1c6970fb58080eb8d4e1 SHA-256: e447214cbbb4115e07d9a1be091acc681f7b2ef51cc10a67074b375e9b7e6826

276 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.001 Malicious Link

This PDF file contains embedded JavaScript that utilizes the 'eval()' function and 'String.fromCharCode()' in conjunction with a custom Base64 decoder. The primary heuristic, CVE_2008_2992, indicates that the JavaScript is designed to exploit a known Adobe Reader vulnerability (CVE-2008-2992) by decoding and executing a malicious payload. The extracted JavaScript files confirm the presence of obfuscated code, likely intended to download and execute a second-stage payload.

Heuristics 8

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)
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)
String.fromCharCode medium PDF_FROMCHARCODE

String.fromCharCode found — used to construct payload strings dynamically (matched inside decoded stream)
Suspicious extracted artifact medium 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.
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_000.js` `9ce977f8eaa7bed30ab257c169e50c0a45e6a655bf3b0557908570cf5b8e1de3`	pdf-javascript-stream	PDF /JS object 13 at offset 0x3CE	3595 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).
`custom_b64_stage_000.js` `9591d45da8dac0cdb39482fdff19422f2a41d09b6f303ae0ce6799c4c4a2ed30`	deobfuscated-js	custom Base64 decoded JavaScript layer 1 (PDF /JS object 13) at offset 0x734	2036 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).

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