PDF malware analysis — malicious · 29e7310c892a033f

MALICIOUS

PDF

69.8 KB

MD5: 0944b4612be5e2c45ed9b307527e8de2 SHA-1: 0b18fcb530a026b9e2024665dd0f08de581c4b1b SHA-256: 29e7310c892a033f2df49007455c9e07fad6bc192deb90a140a67f448485c5dc

318 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF file contains embedded JavaScript that exploits multiple known vulnerabilities including CVE-2009-0927, CVE-2007-5659, and CVE-2008-2992. These exploits are designed to execute arbitrary JavaScript code within the PDF viewer. The extracted JavaScript, particularly the deobfuscated version 'legacy_pdfkit_stage_000.js', indicates a sophisticated attempt to bypass security measures. ClamAV detections further confirm the malicious nature, identifying it as 'Win.Trojan.Agent-36170' and 'Js.Exploit.Shellcode-18'. The script's primary function appears to be downloading and executing a second-stage payload.

Heuristics 8

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)
Collab.collectEmailInfo — CVE-2007-5659 critical CVE exact CVE_2007_5659

PDF JavaScript calls Collab.collectEmailInfo — CVE-2007-5659 is a buffer overflow in Adobe Reader triggered by a long argument or heap-sprayed message field passed to Collab.collectEmailInfo(). Part of a series of Acrobat JS API exploits. (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: Win.Trojan.Agent-36170 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Win.Trojan.Agent-36170
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.
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_obj0008_000.js` `b566f8641f8722b912f24e7d4c54b35e0294ef308dafc2ca6fe86b765b278ef0`	pdf-javascript-stream	PDF /JS object 8 at offset 0x1E7	1667 bytes
Detection ClamAV: Win.Trojan.Agent-36170 Obfuscation or payload: unlikely
`legacy_pdfkit_stage_000.js` `b3946b2ddc63088c6f3dd2475defc6cbc67da06b3edc138ef80f0c2c1cfe81dc`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x89E	4596 bytes
Detection ClamAV: Js.Exploit.Shellcode-18 Obfuscation or payload: likely Carved artifact contains 9 eval/decoder/string-building token(s).

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