PDF malware analysis — malicious · 2dd38d605760ab95

MALICIOUS

PDF

9.6 KB

MD5: f203554cee007e292f7ce1a65dc5b7eb SHA-1: de8a45f61b4ed6c24d2ffaf2c83933a81b873b70 SHA-256: 2dd38d605760ab95f936f7972e04a2bf59de40a02d0b838ff9c0ce439eb67378

126 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.001 Malicious Link T1204.002 Malicious File

The PDF file contains embedded JavaScript that is obfuscated and staged. The critical heuristic CVE_2007_5659 indicates the use of the Collab.collectEmailInfo method to extract and decode a JavaScript payload. This payload is then likely executed, leading to the download and execution of further malicious code. The presence of multiple deobfuscated JavaScript files suggests a complex multi-stage attack. The exact final payload and delivery mechanism are not fully discernible from the provided evidence, hence the 'unknown family' classification.

Heuristics 6

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)
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` `b9a85ee399db318b3ad68d0755effe289a645a7404fad2094712c8a3fd042920`	pdf-javascript-stream	PDF /JS object 7 at offset 0x19B	244 bytes
`annotation_subject_callee_hex_stage_000.js` `20c5f76ab1aadf38bd6b6cc20345677c76afe2b07956ac5cd471e1962b474bb7`	deobfuscated-js	annotation-subject callee-key decoded JavaScript at offset 0x14A	5216 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` `4180d4ff59d77c3e74180720c4b3aaba7875ce3ce754950f76a181e4405b9e68`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2CA	12440 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` `e2e139c4226b46bf436819148e97e31e2d539a4b146e6d351b5a663bfb0ffc34`	deobfuscated-js	PDF JavaScript deobfuscation pass	77438 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).

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