PDF malware analysis — malicious · 38e8f84e93dda2df

MALICIOUS

PDF

40.5 KB

MD5: 294bd6e5d4ecbf6a7b991f8f69f78c1f SHA-1: 8bda3ae957499414002e5cb5b3fd05b2485f5bd8 SHA-256: 38e8f84e93dda2df8f05bf31c9dab828d2b52b5901baf4f80dc1965f0c249b41

180 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious Link

The PDF file contains embedded JavaScript, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. The critical CVE-2007-5659 heuristic specifically points to the use of `Collab.collectEmailInfo` to execute JavaScript, a known vulnerability. The ClamAV detection `Pdf.Dropper.Agent-7250098-0` further confirms its malicious nature. The extracted JavaScript files, particularly `legacy_pdfkit_stage_000.js` and `legacy_pdfkit_stage_001.js`, are likely responsible for downloading and executing a secondary payload, a common dropper behavior.

Heuristics 6

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)
U3D/3D content in PDF — Adobe Reader 3D parser CVE-family indicator high CVE related PDF_U3D_CVE_RELATED

PDF contains U3D (Universal 3D) or 3D annotation content — CVE-2011-2462 and CVE-2009-3953 are critical vulnerabilities in Adobe Reader's U3D processing that allow arbitrary code execution. U3D content in PDFs is extremely rare in normal documents.
ClamAV: Pdf.Dropper.Agent-7250098-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Dropper.Agent-7250098-0
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 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0007_000.js` `1847af0a099665b6ac45af66402e56ed64237a1b287618ee3d6643267fda6f35`	pdf-javascript-stream	PDF /JS object 7 at offset 0x1A4	343 bytes
`legacy_pdfkit_stage_000.js` `0922fb82da5dcb738c3be3f244d63a51916b431be92e698dc8c5ca2a29b96672`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2F7	13122 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).
`legacy_pdfkit_stage_001.js` `b48806a455f66bfcfc9027e4ff10c53b1dafe549b2ba86997c3eb481691c80ee`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2F7	5533 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).
`u3d_00_off00003596.bin` `48816569ab4f370009a917ef6429edbe09e4dfe8a63b00a0a0f75a904c62ba94`	pdf-3d-stream	PDF U3D 3D stream at offset 0x3596	27449 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 7.99, consistent with packed or encrypted content.

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