PDF malware analysis — malicious · a0a68bda3cb3d1a3

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: 6e8b688cbb427d19742b20f6650d8260 SHA-1: 95687b2db3404a0f03fec7d6b592b2502c450d48 SHA-256: a0a68bda3cb3d1a392c9a02326a60ad84f2365161b972ec76438fe878a238935

276 Risk Score

Malware Insights

MITRE ATT&CK

T1204.002 Malicious File T1059.001 PowerShell T1059.003 Windows Command Shell

This PDF file contains embedded JavaScript that exploits CVE-2008-2992 in Adobe Reader. The JavaScript is heavily obfuscated and uses eval() and String.fromCharCode() to decode and execute a malicious payload. The primary intent appears to be the execution of arbitrary code via the exploit, as indicated by the ClamAV detection 'Pdf.Exploit.Agent-35551'.

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` `75e67fb1ec173fbe82c0fe61052f170707ffdb5ac617284e6b5b61e8d30963da`	pdf-javascript-stream	PDF /JS object 13 at offset 0x3CE	3579 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` `8205db7b201c2d33a8e6a1270ab00a86fcaf7d2a74ab4eed199049084445ac60`	deobfuscated-js	custom Base64 decoded JavaScript layer 1 (PDF /JS object 13) at offset 0x734	2025 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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