PDF malware analysis — malicious · a5431ff94263ae04

MALICIOUS

PDF

9.3 KB

MD5: e5325c5ab7ade7855ba812a5cbbab16f SHA-1: 60a512666520bcc236b2d4a47427d7a04c9727af SHA-256: a5431ff94263ae04ad51438acec18ace8d488c1261e6811008584f630df34f7e

126 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.001 Malicious Link

The PDF file contains multiple embedded JavaScript streams, with the primary one identified as a stager for CVE-2007-5659. This stager is designed to decode and execute further JavaScript, likely to download and run a secondary payload. The presence of the 'collab.collectEmailInfo' method and the hex-encoded stager strongly indicate exploitation of this known vulnerability. No specific family could be confidently identified, but the delivery mechanism is a classic exploit PDF.

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` `41b40e4f78a23e02c38840ced37d7b0b7e41bf19f89bd5c83f1250416da69e61`	deobfuscated-js	annotation-subject callee-key decoded JavaScript at offset 0x14A	5006 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` `c4ea78de7de0fee40fecfedaf4f9a2920c3a53ee39e4e16b31a0f677568863a5`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2D4	11874 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` `4318e00042b29135b517a77d01bf8158ce00ffb2cde5340e10f80f65c6f617b5`	deobfuscated-js	PDF JavaScript deobfuscation pass	63037 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).

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