PDF malware analysis — malicious · 82fcb936450ebf61

MALICIOUS

PDF

2.3 KB

MD5: 9f8ed01c83e177473773d4ff3b2b7c91 SHA-1: 6a802f40af127c575e7b084927284157e82750a0 SHA-256: 82fcb936450ebf61ba5105a9ef05532d43a8baa9234f5fe46f7db3d11c82633b

338 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF file contains embedded JavaScript that utilizes eval() and exploits CVE-2009-0927 and CVE-2008-2992. This JavaScript is designed to execute arbitrary code, as indicated by the 'OpenAction' trigger and the 'PDF_JAVASCRIPT' heuristic. The presence of ClamAV detections for 'Pdf.Dropper.Agent-1828818' and 'Pdf.Exploit.Agent-35646' on an extracted artifact further confirms its malicious nature as a dropper. The primary function appears to be the execution of a secondary payload.

Heuristics 9

Collab.getIcon — CVE-2009-0927 critical CVE exact CVE_2009_0927

PDF JavaScript calls Collab.getIcon — CVE-2009-0927 is a stack buffer overflow in Adobe Reader triggered by Collab.getIcon() with a crafted argument. Allows arbitrary code execution. (identified after JavaScript deobfuscation)
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.Dropper.Agent-1828818 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Dropper.Agent-1828818
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
eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution (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 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0009_000.js` `202f0e50dff8111b53fdbc1409a36dde2b9cd6970ec751ee97b5203927f5e238`	pdf-javascript-stream	PDF /JS object 9 at offset 0xBC	20666 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).
`legacy_pdfkit_stage_000.js` `de3a37f3183cf7a64afa6f21b3a01a3f6d38333541b8563bb8c8554dc12af274`	deobfuscated-js	split-join delimiter stripped JavaScript at offset 0xE8	5633 bytes
Detection ClamAV: Pdf.Exploit.Agent-35646 Obfuscation or payload: likely Carved artifact contains 11 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).

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