PDF malware analysis — malicious · 2171de64d6d4fd72

MALICIOUS

PDF

9.6 KB

MD5: b4256c673e8039c1790dc20e81711cac SHA-1: 85681aeb4a641cd7d8a409c76622c15b104e57e6 SHA-256: 2171de64d6d4fd728f50cd679ef0cac4d9b20c2967cb0f543f3cbeec02a3cdea

186 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File T1027 Obfuscated Files or Information

This PDF file contains obfuscated JavaScript, triggered by a vulnerability (CVE-2007-5659) related to PDF annotations. The primary JavaScript payload is heavily obfuscated, but analysis indicates it decodes and executes further stages of malicious code. The presence of multiple deobfuscated JavaScript files suggests a complex, multi-stage attack designed to evade detection and deliver a final payload.

Heuristics 7

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: Heuristics.PDF.ObfuscatedNameObject critical CLAMAV_DETECTION

ClamAV detected this file as malware: Heuristics.PDF.ObfuscatedNameObject
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.
syncAnnotScan annotation-staging primitive low PDF_FOXIT_SYNCANNOTSCAN

PDF JavaScript calls syncAnnotScan() — a no-op annotation-enumeration primitive used by exploit-kit JavaScript to stage payload reads from annotation /Subject fields before eval(). Not a vulnerable sink itself; rarely seen in legitimate PDFs. (matched in decompressed stream)
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` `11b03694c4e705ab29873cc5e2c55342ee498b376ac2dc5f05ce17018ef44c38`	pdf-javascript-stream	PDF /JS object 7 at offset 0x19D	264 bytes
`annotation_subject_callee_hex_stage_000.js` `2a664bb6f659cbfd4dfabf4d3b6c5d038e96bd804be4bcf07cd9ba5e13f8e7da`	deobfuscated-js	annotation-subject callee-key decoded JavaScript at offset 0x14A	5244 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).
`legacy_pdfkit_stage_001.js` `234008fbcd97ea523df769d256079cb0c0b693fbe0996ca64e4a341c5c614376`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2CC	12536 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).
`deobfuscated.js` `d90417a6e15e310b586b150bc03e32a0a68f91dcf646913d170bf9ccb18c6877`	deobfuscated-js	PDF JavaScript deobfuscation pass	76759 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).

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