PDF malware analysis — malicious · 8d2f6ea6a66affcc

MALICIOUS

PDF

9.5 KB

MD5: f5e76f7148f085921fc10cf079d9a6d8 SHA-1: 984eef76c198522a247b7aadd0f48559c85498ad SHA-256: 8d2f6ea6a66affcc4f2ba0f4dc740fb35ff18fd3382ed0a59eb4aa97c2eacab2

186 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF document contains embedded JavaScript, triggered by the CVE-2007-5659 vulnerability related to the Collab.collectEmailInfo function. This JavaScript is heavily obfuscated and appears to be a stager designed to download and execute further malicious content. The presence of multiple deobfuscated JavaScript files and ClamAV detection of 'Heuristics.PDF.ObfuscatedNameObject' strongly indicate a malicious intent to compromise the user's system.

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` `2ee8fcedcdf0e72375785b719881ee1a2995dfbc307f6b8d27e1d6ca2b80346f`	deobfuscated-js	annotation-subject callee-key decoded JavaScript at offset 0x14A	5178 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` `bdb5e635537335cd24f2a1188860c7e77a9b0fc78a84d844468f1bebb4bd7406`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2CC	12253 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` `933ab3666644cdae9d79fca70cca1e1372ef0dfa011a189195246ac003cd3add`	deobfuscated-js	PDF JavaScript deobfuscation pass	68376 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).

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