PDF malware analysis — malicious · b57b361ff1cae53e

MALICIOUS

PDF

9.5 KB

MD5: cca6ef9e216f97e2a6e77f5dfbd354ea SHA-1: be2523f8226f0110920d145ca6202bf17d33c15b SHA-256: b57b361ff1cae53e357b043e8ebf042e1e6eafe0d71af0452833589023ecc2c6

186 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF file contains multiple layers of obfuscated JavaScript, indicated by heuristics like PDF_JAVASCRIPT, PDF_JS, and PDF_ANNOT_SUBJECT_CALLEE_HEX_STAGER. The critical CVE-2007-5659 heuristic specifically points to the exploitation of a known PDF vulnerability using the Collab.collectEmailInfo method to execute a hex-decoded JavaScript stager. The large size of the deobfuscated JavaScript files suggests complex malicious functionality, likely involving downloading and executing further payloads.

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` `fa9f664f248d9c9a966328022519c8f846baa1577aa1d73ae0dbe6272c328495`	deobfuscated-js	annotation-subject callee-key decoded JavaScript at offset 0x14A	5245 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` `b7b3f29d48b6607cf8e67c1b282b25da6b5b8fd6b73775505d7fea95d6eefe2a`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2CC	12252 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` `42c905369614c108f15af82a90de0d18bbfadbe79bc7a483294c53284278730d`	deobfuscated-js	PDF JavaScript deobfuscation pass	70260 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).

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