PDF malware analysis — malicious · cd2fe4f3d0b60f18

MALICIOUS

PDF

9.4 KB

MD5: be38d86ed3f11b033ab8f6862d485291 SHA-1: c4790005e120d9d075ba9e857c1f691d67d557d2 SHA-256: cd2fe4f3d0b60f18d0076d0a6bac60ba22369442863b59195be311558c5b2bad

126 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript T1204.002 Malicious Link

The PDF exploits CVE-2007-5659 using a JavaScript stager found in an annotation's subject field. This stager is designed to decode and execute further malicious JavaScript. The primary mechanism involves the `collab.collectEmailInfo` method, which is a known vector for this vulnerability. The embedded JavaScript is heavily obfuscated but ultimately aims to download and execute a second-stage payload.

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` `dc37160715dd481d0bf49e7af5079aad16ed0e66896c1ae05ca27000b3e4454e`	pdf-javascript-stream	PDF /JS object 7 at offset 0x19B	259 bytes
`annotation_subject_callee_hex_stage_000.js` `7875d2fae3b6c8b965e89a7631ef0986556b84985f9e9d8193283385ccb80b53`	deobfuscated-js	annotation-subject callee-key decoded JavaScript at offset 0x14A	5019 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` `8269fa7585faf407334dadfe6b660088de8ea7bfc259e264e56d720eee52bf63`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2D4	12047 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` `39a336a62bfb001fe8d38a7af5d3abe1b254cd44b140c31747e3853d5f140ccf`	deobfuscated-js	PDF JavaScript deobfuscation pass	69049 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).

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