PDF malware analysis — malicious · 2423114301f70afc

MALICIOUS

PDF

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

MD5: 54dd2163218beac6a2448662666f6a60 SHA-1: 1a7d33067637101ba43241dcd69158c0c248319b SHA-256: 2423114301f70afcda302696f89c77f0b8c2c8da93337ad54b6d33c4f2d24de4

276 Risk Score

Malware Insights

MITRE ATT&CK

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

This PDF file contains embedded JavaScript that utilizes the eval() function and String.fromCharCode, indicative of exploit code. The critical heuristic CVE_2008_2992 specifically identifies a custom Base64 decoded JavaScript layer designed to exploit Adobe Reader. The embedded JavaScript is likely responsible for downloading and executing a second-stage payload, as suggested by the ClamAV detection of '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` `e5204a1bec0d33eaef470251352edb8d59b67a22969a5fcb67c7350a1a83b18c`	pdf-javascript-stream	PDF /JS object 13 at offset 0x3CE	3563 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` `94b9c8f5e15e8651330cbe4c179112fef1026a946f3ab1d1ac21e5ba32ffedcb`	deobfuscated-js	custom Base64 decoded JavaScript layer 1 (PDF /JS object 13) at offset 0x734	2013 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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