PDF malware analysis — malicious · 580555ecaae4dc31

MALICIOUS

PDF

44.9 KB

MD5: 6a3dac43dbfe3924754ddc6803f01c0a SHA-1: 6599651fd358ef8e53183d78e401869afe00eed9 SHA-256: 580555ecaae4dc31f273480a6a35dc900683b42fd9877a76bc7ae5cac6100938

166 Risk Score

Malware Insights

MITRE ATT&CK

T1204.002 Malicious File T1059.001 PowerShell T1059.007 JavaScript

The PDF file contains embedded JavaScript that is obfuscated and appears to be a stager. The critical heuristic firing for CVE-2007-5659 indicates exploitation of a known vulnerability in Adobe Reader via the `Collab.collectEmailInfo` function to execute this JavaScript. The JavaScript is further processed by a hex decoder before evaluation, suggesting it's designed to download and execute a second-stage payload. The presence of U3D content also points to potential exploitability.

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)
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.
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_obj0009_000.js` `6402188dc54eaae16fe40034ed1698c6f7f383a0bcaaf6c05002d19c4fcfb3a8`	pdf-javascript-stream	PDF /JS object 9 at offset 0x44DD	466 bytes
`annotation_subject_callee_hex_stage_000.js` `eddc22f333a9d141836b2ca61423f34df314f260ee2e250633b98955035b622f`	deobfuscated-js	annotation-subject callee-key decoded JavaScript at offset 0x1B74	5496 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).
`deobfuscated.js` `02cc88aa2b29da556364f78858a3e60a928ab280633e37780c1361bdeb284488`	deobfuscated-js	PDF JavaScript deobfuscation pass	320767 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 long base64-like blob(s).
`u3d_00_off00004726.bin` `a96e1fca2499edf504d3934052ca1fc338d4b4898a65e6a361937ed1ba0dc0fe`	pdf-3d-stream	PDF U3D 3D stream at offset 0x4726	28021 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 7.79, consistent with packed or encrypted content.

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