PDF malware analysis — malicious · 3c3f5797ac957787

MALICIOUS

PDF

2.8 KB

MD5: 3851e9abfb46d09f9d46e2ae5925d059 SHA-1: 4b5ed49b6c8e0ad1e535d82bf0381bf0070db62f SHA-256: 3c3f5797ac95778744bd6e49ed89cc8a4b93a79931ac52c500a2c9cbf62e5d57

238 Risk Score

Malware Insights

MITRE ATT&CK

T1204.002 Malicious File T1059.001 PowerShell

This PDF file contains embedded JavaScript that is obfuscated and utilizes the unescape function. Critical heuristics indicate exploitation of CVE-2009-4324 via the media.newPlayer object, and ClamAV detections confirm it as a PDF dropper. The embedded JavaScript, identified as 'javascript_obj0008_001.js', is likely responsible for downloading and executing a second-stage payload, as suggested by the 'Js.Exploit.Shellcode-18' signature on the extracted artifact.

Heuristics 7

media.newPlayer — CVE-2009-4324 critical CVE exact CVE_2009_4324

PDF JavaScript calls media.newPlayer — CVE-2009-4324 is a use-after-free in Adobe Reader's multimedia plugin triggered by media.newPlayer(). Actively exploited as a zero-day in December 2009. (matched in decompressed stream)
ClamAV: Pdf.Dropper.Agent-7138987-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Dropper.Agent-7138987-0
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.
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_obj0008_001.js` `6fb676ac938f2827fa2f5d791ea582e829ddb872a227303b7152d07598753c7a`	pdf-javascript-stream	PDF /JS object 8 at offset 0x193	5877 bytes
Detection ClamAV: Js.Exploit.Shellcode-18 Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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