PDF malware analysis — malicious · cdcd541628e0ba2b

MALICIOUS

PDF

3.4 KB Created: 2009-09-04 15:05:22 Authoring application: jp2eM3QiFwnVi5 (via J5xy6pDii3H)

MD5: 086c18f3144dd592bc068bb225075acc SHA-1: 7ff2afd75db99088776b80fb44a7773357cc4fa5 SHA-256: cdcd541628e0ba2be8df06fc00bec3ddc02d17693596c968a95ea9ed948e3398

218 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF file contains embedded JavaScript triggered by an OpenAction, exploiting CVE-2008-2992 via a util.printf call. The embedded JavaScript, identified as javascript_obj0007_000.js, is heavily obfuscated but likely attempts to download and execute a second-stage payload. ClamAV detected a Win.Trojan.Agent signature on an extracted artifact, further indicating malicious intent.

Heuristics 7

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. (matched in decompressed stream)
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.
OpenAction trigger high PDF_OPENACTION

PDF has an /OpenAction — code runs automatically when opened
unescape() call high PDF_UNESCAPE

unescape() found — often used to decode shellcode in PDF JS exploits (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.
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 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0007_000.js` `059bf298a952a442339983bfc71dde2b8598fb17ed55fb17dae1dab0a19bade8`	pdf-javascript-stream	PDF /JS object 7 at offset 0x241	2168 bytes
Detection ClamAV: Win.Trojan.Agent-36168 Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).

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