PDF malware analysis — malicious · 36ac7f6c6b3688bd

MALICIOUS

PDF

69.7 KB

MD5: 640d3b91d2b04c7487686133fb1045c4 SHA-1: 8b4941cae8872bd105a27002ed01b755c52119f2 SHA-256: 36ac7f6c6b3688bdf17eb1aa8720f7489e71528fb7100e33ea9138da560810c9

318 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.001 Malicious Link

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 code. The ClamAV detection on an extracted artifact, 'legacy_pdfkit_stage_000.js', further indicates malicious intent, likely involving the download and execution of a second-stage payload. The reconstructed JavaScript string 'v'+bkZProKajq89[3]+'r qGTyVwMSZi15 = /'+bkZProKajq89[7]+bkZProKajq89[8]+bkZProKajq89[8]+'/'+bkZProKajq89[9]+bkZProKajq89[10]+';' suggests the construction of a URL for payload retrieval.

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-36169 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Win.Trojan.Agent-36169
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` `69ea6a2f8886c7b6920a89a058b6a6827988e6be53199f3f507cdd673b40e21d`	pdf-javascript-stream	PDF /JS object 8 at offset 0x1E7	1903 bytes
Detection ClamAV: Win.Trojan.Agent-36169 Obfuscation or payload: unlikely
`legacy_pdfkit_stage_000.js` `2e7bd32e72c324e63b87ea551f664f537af1e257b29b0987d7602aa718606000`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x98A	4578 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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