PDF malware analysis — malicious · e51ab685b28e41a1

MALICIOUS

PDF

9.5 KB

MD5: d8de3c27a7bf8afce89e81e7054f5527 SHA-1: 793587b9f9a71f4784c78c8b9f249de2e1cd0522 SHA-256: e51ab685b28e41a109ad0c555c4af5cc89a24b7fe072d1be5ddba6a8a05143c4

186 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF file contains heavily obfuscated JavaScript, triggered by the CVE-2007-5659 vulnerability related to `Collab.collectEmailInfo`. The JavaScript is designed to act as a stager, likely downloading and executing a second-stage payload. The presence of multiple deobfuscated JavaScript files indicates a complex, multi-stage attack. The ClamAV detection for `Heuristics.PDF.ObfuscatedNameObject` further supports the malicious nature.

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` `3ccce8b546ceae04206b56fa7584c17f0824fd3ea82833d3f27f11b589f0cb71`	deobfuscated-js	annotation-subject callee-key decoded JavaScript at offset 0x14A	5136 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` `47dd8065192fab8b0084ae9ddcf202f9185947e58f042cecd56bc69821323ef7`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2CC	12083 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` `c0e24ed87a5d2b1116e7f1aa5065564226dcb059e1697a622b49109df7a1ff1c`	deobfuscated-js	PDF JavaScript deobfuscation pass	70771 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).

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