PDF malware analysis — malicious · 20ff4b1d3886add7

MALICIOUS

PDF

12.2 KB

MD5: a88c1abc2147c33dfbd63303373ebd1d SHA-1: f492a93c4da38fa1ec989861975bf07457ece5ad SHA-256: 20ff4b1d3886add72ec494494a98f29ffb3cd13730bb63e02a94b16bc79bb364

178 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.001 Malicious Link

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings including 'PDF_JAVASCRIPT' and 'PDF_JS'. The critical 'CVE_2007_5659' firing suggests exploitation of a known PDF vulnerability related to the 'Collab.collectEmailInfo' function. The 'annotation_subject_callee_hex_stager' heuristic indicates that a hex-encoded JavaScript stager was recovered from the annotation subject. This stager is likely responsible for downloading and executing a second-stage payload, although the specific payload and its destination are not detailed in the provided evidence. The ClamAV detection further confirms the malicious nature of the file.

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)
ClamAV: Pdf.Exploit.Agent-36180 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Agent-36180
Annotation subject callee-key hex JavaScript stager high PDF_ANNOT_SUBJECT_CALLEE_HEX_STAGER

PDF JavaScript uses syncAnnotScan()/getAnnots() to read an indirect annotation /Subject stream, percent-decodes it through marker replacement, then uses a callee.toString()-derived key to decode and eval the final exploit stage.
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_obj0007_000.js` `17e11d5c0e7abf0d400044cf4333a75f193b35e2745d65fea155eb4de3ce3aa6`	pdf-javascript-stream	PDF /JS object 7 at offset 0x1A6	628 bytes
`annotation_subject_callee_hex_stage_000.js` `2f48e82c0f83fe7305917f48e62840f3652a7d65df1a2577c78d631add88baef`	deobfuscated-js	annotation-subject callee-key decoded JavaScript at offset 0x14F	5387 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

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