PDF malware analysis — malicious · d030a15411c4455b

MALICIOUS

PDF

9.7 KB

MD5: df8be5c4e367f7abdad9c7864489d19a SHA-1: 88d5667a9ea5e2f6b76cc5b99f8e4498c7222902 SHA-256: d030a15411c4455bbbd348f01f5b9587c7d82618eb1a7083376089b3ada1c23f

126 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.001 Malicious Link T1027 Obfuscated Files or Information T1140 Deobfuscate/Decode Files or Information

The PDF file contains multiple embedded JavaScript streams, with a critical heuristic identifying the use of CVE-2007-5659 via the Collab.collectEmailInfo method. This technique is used to decode and execute a hex-encoded JavaScript stager. The stager is heavily obfuscated, but the presence of multiple deobfuscated JavaScript files indicates a multi-stage payload delivery. The primary attack vector is the exploitation of a known PDF vulnerability to achieve arbitrary code execution.

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` `a325cd3b15c2c6940bc62b4005b24a36e93cfc3003b9258f900ef5d0fded3205`	deobfuscated-js	annotation-subject callee-key decoded JavaScript at offset 0x14A	5224 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` `2d1b4ce27da3e575992cea84f2a52c9b1e7378f17248197c1a54b309e17e7db3`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2D4	12449 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` `0060d5dee99deb8cdd70c6143b3735d800e2354b4ac282192cf774f6b77bf380`	deobfuscated-js	PDF JavaScript deobfuscation pass	45660 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).

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