PDF malware analysis — malicious · 580afdbb2c3dbdd6

MALICIOUS

PDF

11.8 KB

MD5: bc0f0c6dbe1eaedea6bced2a3ae5b14c SHA-1: ee39a3405ff6014c4391c71070e6b8b3b7514ccb SHA-256: 580afdbb2c3dbdd6a16c444873dd62c5f3006001c233c57b5607c8ae4de64f2d

186 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF file contains embedded JavaScript, specifically triggered by an annotation subject. Heuristics indicate the use of `String.fromCharCode` and a hex decoder, suggesting obfuscation. The critical finding of CVE-2007-5659 points to an exploit targeting the `Collab.collectEmailInfo` function. This exploit likely downloads and executes a second-stage payload, as indicated by the recovered JavaScript stager.

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: Pdf.Exploit.Agent-36088 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Agent-36088
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.
String.fromCharCode low PDF_FROMCHARCODE

String.fromCharCode found — used to construct payload strings dynamically. Common in benign JavaScript libraries for codepoint manipulation, so this alone is informational; weaponised use is also caught by the dedicated fromCharCode-stage and exploit-shape rules. (matched inside decoded 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 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0007_000.js` `9fd87306e37a04c361ea1b68a1cf4474b7a018e2270929a8c382cd129d8fc406`	pdf-javascript-stream	PDF /JS object 7 at offset 0x19C	566 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).
`annotation_subject_callee_hex_stage_000.js` `ae61c8577e787437fec95f07f58eab8a030ecffa7abce4a347bbe4b25e6e51df`	deobfuscated-js	annotation-subject callee-key decoded JavaScript at offset 0x14A	5284 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

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