PDF malware analysis — malicious · ddc1406ce45caa87

MALICIOUS

PDF

12.4 KB

MD5: 3bf294ec67970a2223823cd8bcdaf348 SHA-1: 0869df56c168fb70e16d8ee776a180761e5d9723 SHA-256: ddc1406ce45caa871b12ffe01e648c4f4e7e32b756e95f678d2b2cfde8f84f69

138 Risk Score

Malware Insights

MITRE ATT&CK

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

The PDF file contains JavaScript embedded within an annotation subject, which is percent-decoded and evaluated. This leverages the CVE-2007-5659 vulnerability. The heuristics indicate that this stager decodes and executes further JavaScript payloads from the embedded files legacy_pdfkit_stage_000.js and legacy_pdfkit_stage_001.js. The exact nature of the final payload is not discernible from the provided evidence, but the initial execution chain is clear.

Heuristics 5

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 percent-decoding eval stager critical PDF_ANNOT_SUBJECT_MARKER_EVAL_STAGER

OpenAction JavaScript forces annotation enumeration, reads an annotation /Subject payload with getAnnots(), rewrites marker bytes into percent escapes, decodes it with unescape(), and dispatches it through eval. This is a high-confidence exploit-kit staging pattern. It is intentionally not mapped to CVE-2009-1492 unless getAnnots() itself carries the crafted integer or long argument shape for that vulnerability.
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.
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 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0007_000.js` `1847af0a099665b6ac45af66402e56ed64237a1b287618ee3d6643267fda6f35`	pdf-javascript-stream	PDF /JS object 7 at offset 0x19D	343 bytes
`legacy_pdfkit_stage_000.js` `577e6cdce0753da7ec60be945898f363ea06554ee7e2b29ec0dc10b41cfdb85c`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2F0	12100 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).
`legacy_pdfkit_stage_001.js` `fae81cfa92b877e19fd03d830fc66c9f72fc611cfbd414f97be341b09bb81e13`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2F0	4975 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

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